Top critical review
One person found this helpful
on 17 May 2015
Always used this product but never really found it totally helps keep the water clean. I was told that it would help with water clarity but I've never found it to (not without the support of a UV cleaner which was the best Aquarium purchase I ever made).
However, having said that, it is safe for the fish and mine have lived in it for years. On the rare occasion when I have have to perform a total water change )issue with a leaking tank), I was able to return the fish to the tank just a few hours later by using this product.
Word of warning- check the date before opening the product as the last one I received was past its use by date. Had a full refund though.