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Operator
Good afternoon, and welcome to the Nephros Inc. second-quarter 2022 financial results conference call. (Operator Instructions) Please note, this event is being recorded. I would now like to turn the conference over to Stephanie Prince from PCG Advisory. Please go ahead.
Stephanie Prince - Senior MD, IR and Communications
Thank you, Gary, and thank you all for participating in Nephros' second-quarter 2022 conference call. Before we begin, I would like to caution you that comments made during this conference call by management will contain forward-looking statements regarding the operations and future results of Nephros.
I encourage you to review Nephros' filings with the Securities and Exchange Commission, including without limitation, the company's Forms 10-K and 10-Q, which identify specific factors that may cause actual results or events to differ materially from those described in the forward-looking statements.
Factors that may affect the company's results include but are not limited to the impact of the COVID-19 pandemic, Nephros' ability to successfully, timely, and cost effectively market its products and service offerings, the rate of adoption of its products and services by hospitals and other health care providers, the success of its commercialization efforts, and the effect of existing and new regulatory requirements on Nephros' business and other economic and competitive factors.
The content of this conference call contains time-sensitive information that is accurate only as of the date of the live call today, August 10, 2022. The company undertakes no obligation to revise or update any statements to reflect events or circumstances after the date of this conference call, except as required by law.
I would now like to turn the call over to Nephros' President and Chief Executive Officer, Andy Astor. Andy?
Andy Astor - President & CEO
Thank you, Stephanie, and good afternoon, everyone, and welcome to the call. I am pleased to report our second-quarter results, which were strong at the top line. Net revenue was $2.9 million, an increase of 27% year over year, and 32% over the previous quarter. Also, active customer sites increased 21% year over year to a record 1,349, which were also 6% higher than the previous quarter. Customer retention rates remain comfortably over 90%.
While top-line growth remains our top priority, we also recognize that Nephros needs to become profitable. As we announced last month, Nephros expects to be cash flow positive by mid-year 2023.
Of course, we remain focused and optimistic about revenue growth, but we are also taking steps to tighten our belt. In the quarter ended June 30, these steps included a 15% headcount reduction, reduced use of professional services, and initial work towards production and inventory efficiencies. As of July 1, operating expenses have been reduced by more than $300,000 per quarter. We expect our ongoing actions to reduce expenses further in the coming quarters.
I'll now give a brief overview of some sales and marketing highlights. Wes Lobo, our Chief Commercial Officer, would normally give this update, but he is on vacation this week.
As we announced on the previous earnings call, Nephros launched its new web presence at the beginning of Q2. In his remarks at that time, Wes said the launch of that -- quote, the launch of our new website provides the digital architecture to articulate our value proposition, provide easier discovery of product solutions, and produce timely relevant materials for our customers. I am pleased to report that just four months later, the website is delivering benefits, including lead generation, that has led to new revenue in the tens of thousands of dollars, so far.
In addition, we continue to build our regional sales teams to provide dedicated support to our distributors and our end customers. We have coverage in most of our important markets and are actively recruiting for the rest.
Our medical water filtration businesses, primarily hospital infection control and dialysis water purification, were both strong this quarter, also ending with record numbers of active customer sites. In the commercial filtration business, I am pleased to report that we shipped over 3,000 filters this quarter for installation in Chipotle restaurants nationwide. The replacement cycle for these products is every six months.
We expect the brand equity from this relationship to unlock additional opportunities in the food-service and beverage space going forward. And in the pathogen detection business, we have completed agreements with two strategic testing partners and anticipate a steady build of sales over time.
And finally, with the previously announced FDA, 510(k) clearance of the HDF assist product from our subsidiary Specialty Renal Products, we are now in discussions with dialysis clinics for a rollout to patients around the end of this year.
I'll now turn to a few details of our financial result. We reported second-quarter net revenue of $2.9 million, a 27% increase over prior year. Factors impacting this growth included organic growth, the Chipotle shipment I discussed earlier, and also some pull-ahead sales due to a price increase implemented June 1.
Net consolidated loss for the quarter was $1.1 million, approximately the same amount as the second quarter or Q2 of 2021. Consolidated adjusted EBITDA in the quarter was negative $0.7 million, compared with negative $0.8 million in Q2 of 2021.
Consolidated gross margins in the quarter were 47%, compared with 57% in Q2 2021. This decrease is primarily due to global inflationary and supply chain trends, in addition to some inventory exploration. We expect the June 1 price increase to improve our margins and continue to target future gross margins of 55% to 60%.
Consolidated research and development expenses in the quarter were $0.4 million, compared with $0.5 million in Q2 2021. Consolidated sales, general, and admin, or SG&A, expenses in the quarter were $2.0 million, compared with $1.9 million in Q2 of 2021. And our cash balance on June 30, 2022, was $4.2 million. We reassert that our current cash balances are expected to suffice for the foreseeable future.
Please refer to today's press release for more details about the calculation of adjusted EBITDA and its reconciliation to GAAP net income or loss. Additional information about our results, including our water filtration, pathogen detection, and renal products business segments will be found in our filing on Form 10-Q, which we plan to file on Monday, August 15.
That concludes the financials discussion, and we'll open the call to questions in just a minute. But first, I would like to thank each of our Nephros' employees and our strategic partners for providing unsurpassed products and services to our customers, especially this year during some difficult times.
And thanks also to our devoted investors for your continued confidence and your patience. We know that these are challenging times for our investors. And yet, we believe that our ability to navigate the short-term results will be to our ultimate benefit as we maintain our commitment to investments in scalable, commercial, and operational infrastructures as a path towards long-term sustainable growth.
This concludes our formal presentation remarks. We will now take questions from the audience. Gary, please open the call for questions.
Operator
(Operator Instructions) Marc Wiesenberger, B. Riley FBR.
Marc Wiesenberger - Analyst
Yes, thank you. Good afternoon. Appreciate you taking the questions. And Andy, it's nice to hear a more upbeat tone from you relative to the last quarter. So congrats on the efforts.
Andy Astor - President & CEO
Thank you, Marc. Nice to hear your voice.
Marc Wiesenberger - Analyst
I would like to start maybe with the gross margins. We did see some nice stabilization and sequential increase. How should we think about that ramping into the second half of the year? And do you anticipate getting back into the target range by the end of this year?
Andy Astor - President & CEO
In this economy, it's hard for me to say a simple yes or no. I'm glad they have stabilized. There will be some more pressure from product expiration, but I don't think I have -- what we have not seen is continued increases in shipping. Indeed, I just heard yesterday that our air shipments, which we don't do very much of, but air shipping costs have actually gone down.
So the fact that prices are not going up and the fact that we have a price increase that for most of our customers went into effect on June 1, should give us upward -- should positively impact our gross margin. And so I do think we will see modest increases in it over the course of the next couple of quarters.
We probably won't be back at target range of 55% to 60% overall. I don't know if it'll be this year or if there -- or if it will be early next, but we'll be moving -- we intend to move in that direction in the next few quarters. That'll be part of our plan, of course, of getting to cash flow -- positive cash flow.
Marc Wiesenberger - Analyst
Got it. Okay, we'll be looking for that continued progress.
Andy Astor - President & CEO
Thank you.
Marc Wiesenberger - Analyst
Moving down the P&L, how should we think about OpEx building off the 2Q levels? And I guess as growth ramps, is the current infrastructure sufficient for that expansion? And then I did hear you mention expanding the sales team a little bit in certain regions. Is this kind of a shift in emphasis from distribution partners to maybe more of a direct sales force? Or how do I interpret that comment there?
Andy Astor - President & CEO
I think the answer to your first question is yes. We are -- our current level will support the growth that we are looking for. So we don't need to significantly increase OpEx in order to grow, when I say modestly, I mean, make up a number, 20%, 30%.
The second question you asked. I'm sorry, just remind me, I've lost my train of thought.
Marc Wiesenberger - Analyst
Sure. No, problem. You talked about expanding, I think (multiple speakers) in certain geographies. Is that kind of an emphasis away from distribution partners to a more direct sales force?
Andy Astor - President & CEO
Thank you. No, not at all. In fact, we have always had direct salespeople to support our partners. So there's absolutely no change to that whatsoever. But what there is not a change to, but a continuation of, is our intent to have geographical regional sales managers within a long drive or a short flight to everywhere in the continental US. And we're making good progress on that.
Marc Wiesenberger - Analyst
Very helpful. And then --.
Andy Astor - President & CEO
And that's, again, not a change from plan.
Marc Wiesenberger - Analyst
Perfect. In terms of the medical filtration market, if you could kind of provide some more insights in terms of what you're seeing there and the different kind of submarkets within there? That would be really helpful.
Andy Astor - President & CEO
Sure. What I would tell you about Q2 is for all three of the filtration markets, which are the two medicals and the commercial, they were normally distributed, they grew -- all three grew nicely, and commercial grew a little extra nicely because of the Chipotle shipment.
So what I would tell you is that there's nothing -- I wouldn't say that solid healthy growth is not noteworthy, but it is what we expected, and it was what we were surprised -- we had a negative surprise in Q1, but we are right back where we thought we would be in all three markets in Q2. Does that answer your question?
Marc Wiesenberger - Analyst
It does. I think this quarter though, does have some lag or delayed from the first quarter. Is that right? Can you remind us how much that was pushed in from the first quarter into this quarter?
Andy Astor - President & CEO
Yeah, not a lot. One of the two, that we mentioned in that last call, did close and the other one got kicked down the road. So I wouldn't spend a lot of time trying to analyze that. I think Q2 is Q2 is Q2. And what I did say in the my opening remarks, and would remind you of is that there probably was some pull-ahead sales.
Not probably, there was some pull-ahead sales on our June 1 price increase probably to the tune of the low hundreds of thousands of dollars, like, let's call it about $250,000 would likely have come into the second-quarter sales that might have not come in until Q3, if not for the price increase.
Marc Wiesenberger - Analyst
Understood. Very helpful. And then just one more, and I'll get back in the queue.
Andy Astor - President & CEO
Sure.
Marc Wiesenberger - Analyst
Looking at the at-home dialysis market, I believe a leading player previously had an FDA hold from shipping some units, which has now been lifted. Were you at all impacted by that in the first half of the year? And now that that has been lifted, do you anticipate that accelerating some of your growth into the second half of the year?
Andy Astor - President & CEO
Yes, and yes. We were impacted by that FDA hold. And there were some holds put on future orders that were planned by both parties. And the lifting of the hold, we do anticipate, although I can't tell you that we have it in hand yet, but we do anticipate that that will bring -- that will contribute to growth in Q3, Q4.
Marc Wiesenberger - Analyst
Great. Let me just sneak in a follow-up to that because it was pretty helpful. I guess, could you quantify potentially what that drag was, number one? And then number two, do you also supply that customer in clinic -- or do you supply filters for that customer in clinic as well as their at home?
Andy Astor - President & CEO
No and no.
Marc Wiesenberger - Analyst
Okay. (multiple speakers)
Andy Astor - President & CEO
No, I won't quantify the impact. And no, the customer relationship there for the home- and portable-dialysis product.
Marc Wiesenberger - Analyst
Great. I appreciate taking all my questions. Thank you very much.
Andy Astor - President & CEO
That's okay. Good questions as always, Marc. Thank you.
Operator
(Operator Instructions)
Andy Astor - President & CEO
I will offer if there are no further questions, Marc, if you have other follow-ups, you are more than welcome to ask.
Operator
Ralph Weil, R. Weil Investment Management.
Ralph Weil - Analyst
Hi, Andy. Could you comment a little more about the expense cuts and the headcount cuts, where they may have taken place and what parts of the business? And I assume you feel that these were done without hurting your business going forward?
And a second question would be, do you use envision, in view of the fact that you've had this problem, that -- and then even though you say you don't need money that you'll get by, and I hope you will. I sincerely hope you will. Do you see any parts of the business being monetized so that you can concentrate more on any of the ones that are left?
Andy Astor - President & CEO
Thanks, Ralph. Good to hear your voice by the way. The cuts were made across most departments. They were a combination of layoffs and replacement and attrition and so forth. But the cuts were made across, and they were made carefully. And I can't say they weren't painful, but I do think you're correct that I would say that we are able to do 90% of what we need to do.
And I think we made the cuts prudently. And again, it was painful, and it was tough for the organization. We haven't had to do that before. But it is -- I think they were necessary, and we did them. And we're -- I think we're firing on all cylinders. I'm sorry, your follow-on question was regarding the cash balances, is that right?
Ralph Weil - Analyst
Yeah, you say that you don't need money, but your cash has gone quite low. And I'm just wondering, you do have a few different businesses; some of which may be more exciting than others, but they all could grow. But I'm just wondering whether there's any thought on your part to focus more on growing some parts and perhaps monetizing. I wanted to --.
Andy Astor - President & CEO
I understand, and I won't comment on that because those are strategic questions that would be quite material if I discussed them. I won't. I can't say we're ruling them out, nor can I say that we are doing them. But I understand what you're saying.
And we are, of course, looking as always to get ourselves to cash flow breakeven with multiple alternatives in front of us. But we'll do something. What we do, we'll do in a way that -- I know this is not a direct answer to your question, Ralph, but we'll do what we think is best for the overall business. But yes, that kind of thing is -- we're looking at all options.
Ralph Weil - Analyst
Okay. Do you feel that the third quarter, which hopefully will be a continuation -- a positive continuation, but do you feel that it may be negatively affected by the buy-ahead in the second quarter because of the price increase? And do you -- and to offset that, do you see any important things which will, well, I guess, offset that potential decrease due to the buy-ahead?
Andy Astor - President & CEO
It's hard to know. I mean, the buy-ahead is essentially a $0.25 million hit. So do we expect less? Do we expect more? I mean, we have to see when we come out of the quarter. I -- the way I look at this is quarter to quarter, and I really want to get away from trying to explain away what happened in one quarter by what happened in another.
We intend to grow the business. And we have to do that in the face of all occurrences, whether they be price increases or a company losing its FDA clearance temporarily or whatever it may be. So, I don't know. I don't know what else I can say to that.
Operator
Thomas McGovern, Maxim Group.
Thomas McGovern - Analyst
Hi, guys. Thanks for taking the time to take my question, and congrats on the quarter. I just have a quick question following up on one of Marc's earlier questions on OpEx. You mentioned that the infrastructure was ready or that was sufficient for moderate growth, and you threw out a number approximately 30%.
Just to clarify, is that roughly what you would say -- you would expect in an increase in OpEx or is that something that you think you can support like you can support a growth of 30% with the current infrastructure?
Andy Astor - President & CEO
The latter is what I said. What I said was I don't think we need to substantially increase our OpEx. We just decreased our OpEx. And I don't think we need to substantially -- significantly increase it with the kind of growth that we're planning. So we do not plan on increasing our OpEx going in the foreseeable future. Okay?
Thomas McGovern - Analyst
Great. Thanks. Thank you very much for clarifying my question.
Andy Astor - President & CEO
You're welcome, Thomas. Thank you.
Operator
Neil Cataldi, Blueprint Capital.
Neil Cataldi - Analyst
Hey, Andy.
Andy Astor - President & CEO
Hey, Neil.
Neil Cataldi - Analyst
Just wanted to (multiple speakers). You mentioned you're in discussions with dialysis clinics for a rollout to patients by the end of this year. Just wondering if you could elaborate a little bit on that. Does that mean that maybe you'd have to partner with one of these dialysis companies? Or what should expectations be going forward there?
Andy Astor - President & CEO
Well, I think we've been pretty consistent on this, although it's taken longer than we thought, certainly. And that is that our intent is to get into a couple of dialysis clinics. It might be one, it might be three, but it's a small number of dialysis clinics where we can demonstrate for the first time, touching patients.
Since this was a product that was developed without the need for trial, we want to get out in commercialization into one or two dialysis clinics just to get the patient experience and demonstrate the machine's capabilities. And whether that is -- so that we can go from one to two to four to eight to 16. Or it's for strategic reasons, where we just need to get out into a clinic or two to get real, if you will.
We are -- yeah, I mean that -- and that's what -- that is just what we have to do, and we are in those discussions now. Does that answer your question, Neil?
Neil Cataldi - Analyst
Yeah, I guess. The company spent years and millions upon millions of dollars to get to this point, right? And the market hasn't really given you guys any credit for getting the approval, so I'm not sure that investors or the investor universe really appreciates what the magnitude of this might be or even the value that this may have to the company. So are you saying that you need to really prove that it works in the field first before you can then engage with a few of those bigger names that sort of dominate that market?
Andy Astor - President & CEO
Well, it is -- I think that is part of it. Remember that the first version which came out and was approved in 2012 was, frankly, an unusable machine and had a lot of difficulty in the marketplace. And this is the second generation -- vastly easier to use. And we currently have a reputation as a difficult-to-use machine that clinicians rejected. So what we want to do is get out there to demonstrate that we have the machine that we are saying that we do.
I certainly agree with your premise that the market did not give us any credit. And we think that the reason for that is that you said, untold millions of dollars, and frankly, two decades have gone by on the work on this. And we've got a lot to prove, and we're really excited about getting the chance to prove it.
Neil Cataldi - Analyst
Alright, great, thanks.
Operator
Marc Wiesenberger, B. Riley FBR.
Marc Wiesenberger - Analyst
Yes, thank you. You have been seeing some nice steady increases in your active customer sites. I'm wondering if you could talk about what specifically has been driving that and is that dynamic sustainable going forward?
Andy Astor - President & CEO
We think so. The way our -- I like to say that we act like a subscription business, but we're not a subscription business, right? We -- nobody has to buy a replacement filter. They can try to make their filters last longer or they can decide that filters are too expensive and they're going to a different approach. But fundamentally, we're in a recurring revenue model business. And so what we measure is the number of customers that we have who have bought within the last four quarters. That's our active site count.
And if we are -- and I consider that our primary leading indicator, right? The number of customers that are actively buying our product, we want that number to go up. And frankly, it went down a little bit during the pandemic when we contracted revenue wise in 2020.
If I look -- I'm just looking at the numbers now. We were down as low as slightly below 1,100, but we have come up nicely in 2022, up to essentially 1,350 -- 1,349. So yes, I do believe that this number will increase over time on a continuing basis. And I think it's a leading indicator of where our revenues will go.
Marc Wiesenberger - Analyst
Great. And then two more. I think previously, on the last call you were talking about the pathogen detection segment pursuing some two significant customers or opportunities. I'm wondering if you could update us on the progress on those developments.
Andy Astor - President & CEO
Yeah, I did cover that, but I sort of flew over it. There were two companies that are deeply involved in the testing of water. And both of those partnerships are signed, and revenue will start to grow out of them in the near future. I don't know at what pace. I'm not talking about gigantic growth, but I am talking about those -- both of those have been signed.
Marc Wiesenberger - Analyst
Very good. Definitely shouldn't have skipped or flew over those. That's pretty important. Hopefully, we can see that build going forward. And then just finally, last one from me. I think on the last call, you did previously talk about competitors being supply constrained. I'm wondering, have you been able to take any share as a result of that dynamic? And do you foresee any supply constraints for Nephros in the back half of the year? Thank you.
Andy Astor - President & CEO
You're welcome. We have -- we did do a marketing campaign on that and did get some sales. I don't have a number for you, but we did get some sales as a result of our competitors not being able to fulfill orders. And no, in answer to your second question, I do not anticipate any supply chain issues of note with us for the rest of the year. In fact, our supply is healthy, and always has been. We keep it that way.
Marc Wiesenberger - Analyst
Great. Thank you.
Andy Astor - President & CEO
Marc, thank you very much. Those were, as always, great questions. Thank you.
Operator
This concludes our question-and-answer session. I would like to turn the conference back over to Andy Astor for any closing remarks.
Andy Astor - President & CEO
Thanks very much. I'll be super quick. I wanted to say thanks, everybody, for taking time out of your busy day. And I look forward to seeing you, or at least talking to you, in three months on our next call. And in the meantime, please keep in touch, you can always reach me at andy@nephros.com, and I look forward to talking to all of you again soon. Take care, everybody, and have a great night.
Operator
The conference has now concluded. Thank you for attending today's presentation. You may now disconnect.