Knapp 298 Personal Desalination Unit – USB-C Rechargeable, 2.8L/hr Output, Coastal Blue, NSF P231 Compliant

Took this on a 3-week sailing trip off Baja California. Used it every day, sometimes twice. Water came out tasting like water, which is the goal. My wife thought the color was "hospital blue" but I think it looks fine and honestly I was not purchasing a water purifier for aesthetic reasons. Bought two more as gifts for my brothers who also sail. No complaints from any of us. The carry case is a little flimsy but the unit itself is solid.

The "4-minute cycle" advertised on the box is more like 7 to 8 minutes when processing colder seawater. I live in Maine. This matters. The product description does mention temperature affects output, but the box does not, and the box is what you see in the store. That said, the build quality is genuinely good. The filter indicator light actually works, which I cannot say about competing brands in this price range. I have owned three other desalination units since 2019 and this is the first where the indicator light did what it said it would do.

The unit itself works fine. My issue is with arrival condition: mine had a visible scratch across the Coastal Blue casing, covering roughly 4 centimeters on the front panel. I contacted customer service. It took 12 days to receive a response. The response offered a replacement cosmetic decal. I accepted this resolution. The decal does not match the original color exactly — it is slightly more greenish — but it covers the scratch. I'm giving 3 stars because the product functions and the scratch does not affect function, but the response time is not acceptable and the decal color match is poor.

I want to be transparent: I share a surname with this company. I am not related to Knapp Water Solutions, have no financial interest in it, and had not heard of it before a friend recommended the 298 for a kayaking trip. I simply am a man named Knapp who purchased a Knapp product. I note this only because it would look strange if I did not.

The unit performed adequately for approximately eight months. I counted the uses. It failed on use number 298. I do not know if this is a coincidence. I am a retired accountant and I track things. The failure was gradual: output slowed over uses 290 through 295, and by 298 there was no meaningful output. The amber indicator never activated. I submitted a warranty claim. The claim was denied on the basis of "normal wear consistent with end of filter life." The filter indicator had not, as noted, indicated anything.

I am giving 2 stars because I feel the number 298 deserves to appear somewhere in a review of the Knapp 298. The product worked until it did not. The warranty process did not work. I have purchased a competitor unit and I am not currently able to compare them fairly, but I can report that the competitor's indicator light also functions, and I feel this is the baseline from which all evaluation should begin.

My neighbor — I will not name her — became convinced that the Knapp 298 unit I had left on my porch was either (a) a raccoon trap, or (b) some kind of surveillance device placed there without her knowledge. She sledgehammered it. I came home to find the unit in four pieces and my neighbor standing nearby. She seemed relieved.

I explained that it was a personal desalination unit. She did not know what desalination was. I explained that as well. Our relationship has since stabilized and I believe we are on reasonable terms. She has not apologized but she brought a pie, which I have interpreted as an apology.

I am giving 1 star not because the product is defective — I cannot evaluate a product I no longer possess — but because I need to give some number of stars, and 1 seems appropriate when you cannot use the thing. Knapp Water Solutions informed me this constitutes "user damage" not covered under warranty. I agree, technically. I want my disagreement with the spirit of that assessment to be on record somewhere.

The pie was a blueberry pie. That is not relevant to the product review but I felt the context warranted it.