Bought for my "always dirty" tank. I changed the filter, partially changed the water with the addition of various healing liquids and charcoal fillers, it only helped for a few days, then the problem came back. After all the experiments, I bought them these bacteria and little white balls "house of bacteria". The problem seems to be gone for good - the water is always clean, even though I somehow forgot to clean the filter over the weekend. Recommend.
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