A Pre Filter Sponge is the perfect tool to keep shrimp, small fish, and babies safe from being sucked up into the filter. The sponge should be placed over the intake tube, making sure that the fit is snug and secure. Acting as a mechanical filter, the sponge will trap larger particles, while allowing water and smaller particles to pass into the filter. Regular cleaning of the Pre Filter Sponge is recommended to prevent any blockage of water flow. Use tank water when cleaning the Pre Filter Sponge to avoid killing beneficial bacterial that may have colonized the sponge.
| Size | Sponge Diameter | Intake Hole | Length |
| Small | 1.5 inches | 0.5 inches | 2.75 inches |
| Medium | 2.5 inches | 0.5 inches | 3 inches |
| Large | 3.5 inches | 1.25 inches | 5.5 inches |
Overall rating: 5.0 / 5 from 12 reviews.
Review topics: [fit].
"I purchased the large Pre Filter Sponge worried it might not fit my filters bulky intake pipe but it did. Also very happy with the fast free shipping on this item!!"
"Works well for my larger intake filter."
"What I needed"
"Fits perfectly. I bought this to keep fry and shrimp form getting drawn into my filter."
"I have shrimp hiding in the thick growth of Anubis in the center of my 55-gallon tank and I am always finding them in the 2 filters when I clean them. I was trying to find prefilters to fit on larger filters at local pet shops with no luck. So happy I found them on your web site!!"
"I have been looking for replacement sponges for my all glass aquarium overflow filter for quite some time. The originals are well over 20 years old. Could not find the correct size until I stumbled onto this page. These are exactly the same size id and od as the originals. Slid right onto the filter stalk. Thanks!"
"Thanks for the hard-to-find sponge filters"
"Good fit for the intake on my Oase Filtosmart"
"Medium fits over my Oase 350. It's a bit tight but does the job."
"Fit snugly over my existing water fall filter."
