Use these as pre filters for my hanging return filters and they work great! A little too bad for my large tank but gives my shrimp and even my fish a great surface to eat in peace when they get sucked in. The presence of this pre-filter greatly reduces the need to change the media in the filter, making it easy to clean. Just take it off, rinse it out of the tank in a bucket of water and put it back on the inlet.
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