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- no comments I am using charbon twice a year, couple of weeks each time - just to remove eventual chemicals I dont want there. As clarity of water - no effect. I am relying on skimmer only and have crystal water.My opinion is that the carbon quality isn't good and therefore not polishing like you would want it. I'm assuming the marinelands have their own carbon inserts! When did you change the carbon last, and you might have to change it more often!
They have low quality carbon, which may make you change it more. When you do change it how does the water look after a few days?I try to change it at least once a month

