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Used them for a long time, but got tired of cleaning them. They do a good job of keeping the tank/sump cleaner, but must be changed like every 3 days, or at least this was the case with my system. I have bio pellets and the film clogged them up pretty quick !! I think I'm going back to them because my sump is now pretty dirty do to about a year of not using them. There's also the problem with filter socks and loss of pods. Any thoughts? This was another reason I decided to stop using them.
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