Review on Marineland Penguin Rite-Size B BIO-Wheel 150 & 125 Cartridge: Bulk Pack of 6 - Replacement Filter for Optimal Aquarium Filtration by Darlene Thomas

I bought these to save a few bucks compared to buying in a pack. It worked great when I installed it, but after a day or so the filter started reducing flow. Water began to accumulate and flow through the filter. I pulled it out to make sure it wasn't clogged, it wasn't. Installed a new one, same problem. My solution is to pull the filter up a bit so it doesn't touch the bottom of the filter housing. This allows the water to bypass the filter and flow under the filter. While this reduces efficiency, it ensures that water does not get onto the floor. Overall I like them, but I won't buy them again.