QwikDescaler + Concentrated Descaler Solution, Tankless Water Heater Descaling Solvent for Heat Exchanger, Quickly Dissolves Scale, Lime, Tarnish and Deposits, 1 Gallon

Easy to work with. Seems to have done a great job. Can't confirm visually because components are inside of the tankless water heater. Will use again for sure.

Quality and price excellent.

Seems to work, but how do you know for sure? I flushed my unit for about 2 hours and fluid had turned orange. Not much in the way of mineral buildup. If I could see inside the heat exchanger I would feel better about the whole affair. I like to see a skull and cross bones on the label so you know it’s probably good stuff. This is non-toxic so who knows…?

Thus is my first time i used this product. I have tried 4 other products that cost much more . It seems like a good product. Even shows when you need to add more by a color change. I let this run for hours and my tankless water heater and needed it. I had to add extra product after about 30 minutes of use. I knew because it changed from pink to yellow. Due to the six months since my last descaling. This cost me less and I have some for my next time. So double the savings. I will reorder this next time and every time after. It even worked better then 90% vinegar with none of the smell.

Ended up using the whole bottle cause the color changed to clear after 15 minutes. Definitely removed a lot of scale

Seems to descale my tankless heater well. Hard to tell if it’s better than straight vinegar, but it’s not expensive, so it was worth a shot. May update after a couple more years and testing of my alternatives.

Second year of using this product to descale my Navien NPE-180A2 unit. Year 1 of doing the flushes myself, I mixed up the necessary amount of solution per the dilution rates and followed the instructions for how to flush my system. In total, took about an hour with the flushing process being about 35-40 minutes. The amount of material this solution was able to remove. I remember seeing what the technician got out on the very first flush done on the system and I feel like this removed a lot more. Year 2 of doing the flushes myself, similar results and time it took to use. Extremely happy with the product and results.

Did a good job of removing scale. Noticeable difference

Used this for the first clean of Tankless Water Heater, everything worked as promised.

Second time using this product. Seems to work fine.

Been living at our place for almost 2 years. Not sure when the heater was last flushed so rather than using vinegar I opted for this. Considerably more expensive but the reviews were good. bought the kit that had a pump, hoses and pail on Amazon so i knew all connections would work. Proly cheaper to buy the components, but piece of mind counts for something. Connected everything and I mixed the descaler 3:1 ratio and let it run. Foamed in the beginning a little, and I assume that is the calcium reaction. Now recommended time seems to vary so I let it go for 2 hours checking every half hour. At the 2 hour mark the solution started to change colour, which tells me the long cycle was correct. I mixed up a second batch and ran it for another hour, but no colour change. While I did not see any significant change in water flow or pressure at the tap, the colour change was enough to show me this worked. I will use this product again when I flush.

Works good, less smelly than vinegar. Jug has enough cleaner for 4 applications.

I've used three other products before this stuff on my Rinnai tankless water heater. The last product I used about 5 months prior and I was starting to notice issues so I suspected it needed a clean again so I bought this and it made a huge difference and foamed up a lot which led me to believe it was actually doing something too. My tankless has been running great for a while now... Touch wood.