I have to say the filters work great for the price of this item. I've used it several times to make my own drinking water and honestly it tastes great. I usually buy drinking water but these cartridges work great. I didn't install a polishing filter because I don't have an adapter for my reverse osmosis system. I also have a cartridge (bought elsewhere) in my Ro-Di system, but when I want to make water I just disconnect it from the Di inlet and make drinking water. So far I am very happy with my purchase.
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