Aquascape 91035 Replacement Filter Sponge Kit (4-Pack) for Ultra 800 GPH Water Pump – Compatible with Pond, Fountain & Waterfall Filtration Systems

We weren't sure if these would work so we bought them on spec. We were pleased to find that they fit the pump that we had for a few years in small pond. The replacement with this sponge filter has increased the flow of the water through the pump. There were four in teh pack so no need to look for future replacements. Thank you!