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It wouldn’t hurt to try. Though I’ve not seen what the filter looks like. A rock might push water around but will it reduce flow? Not sure. It’s a theory that should be tried out.jaymethy said:I don't know if this will work, but maybe try putting a rock inside the filter to stop it from being able to process as much water. I've never tried it, but I figure you might as well try because it wont cost you anything.