My wife told me how expensive alkaline water is but how good it is for you. I saw an opportunity to add a stage to our new reverse osmosis system and after reading the reviews I purchased this filter and an additional set of filters. I was planning to raise the pH by just 0.5-0.8 but that didn't happen. I found my results too high so I drained the tank and had it refilled and got the same results. A picture says 1000 words. I am attaching a picture showing pH 6.7 which was my old GE Profile reverse osmosis system product. The figure below shows a pH of 7.05, which corresponds to an iSpring reverse osmosis system with no alkaline filter. And finally the results of the system with an alkaline filter after emptying and refilling the tank. Once again I got a pH of 10+. The water tastes great. I will post new pH results after a month or two of using this filter. To update. So I installed it from October or 2017 and now in May 2018 the pH is still alkaline in the 8.5 range. I bought a new filter and will wait another month before replacing this one. Unbeatable price and quality! I still give five stars!
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