I don't think this thing works at all. First, it smells like rotten eggs. changes weekly with it and I still get the same results testing the water with or without it. I test my water weekly throughout the year. I have 300 gallons. I chose this because it claims to do fewer water changes. For the past 2 months I've even tried doubling the dosage with every water change and let me tell you the nitrate levels don't change says it works for nitrates.
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