It was recommended to me over SeaChem PhosGuard because it doesn't contain aluminum like PhosGuard. I've only been using it for a month, but so far I like it. Only time will tell how many times I'll have to change it. Just make sure you rinse it well as it will produce a brown powder and can cloud the aquarium. I'm only giving it four stars for now because I don't know how long it will last before needing to be replaced.
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