First a disclaimer: I've never used this product.
However, I did look at reviews for it about a month ago and it seems like people are getting good results. Can't remember where I got them, but you can probably find them with a cursory search.
The Tap Water Filter is really inexpensive, especially when compared to an RO or DI system, and even when compared to other water purifiers not for aquarium use. and the replacement cartridge is cheap and easy to find. It seems to me that if you want a tap water purifier without a big investment, this one will do fine.
The drawback would be its low capacity - at 10 gallons an hour and about 150 gallons capacity in a cartridge, this would be a pain for large tanks.
Pearl
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