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Has anyone found the Juwel Nitrate Removal Spongues to be effective?? I've had mine a couple of weeks in my main internal filter (Vision 260 Standard H type) and not seen the level decrease at all. The tank was recently stripped down and restarted with a few occupants including established...

Do you have the flow adjuster a full rate? I found that the whole filter can be a little bouyant but if you have the flow rate at maximum the filter gets pulled down by the flow force.