I have only used this filter. I have a 55ga reef and I change 5-10 ga of water every 1-2 weeks. I have never had any water related problems. I change the filter when the slight purple tinge in the filter media reaches the top of the filter. It lasts about 3 months depending on how much stuff it's removing from the tapwater and if your making water for extra water changes, cycling live rock, ect.
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