Follow the instructions; I used this tablet weekly for 4 weeks and then once a month in a 350 gallon aquarium with giant koi, shubunkin and very large goldfish. In the first week the water was cleaned. Missed the second week and he started slipping back. Started fresh, done 4 weeks and now monthly --- crystal clear water! I always did weekly water changes. Highly recommended.
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Tetra AquaSafe tap water treatment agent, 5 l
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