Review on Premium RO6G BCP Pre-Filter Foam Sponge 🐠 Roll – Essential for Crystal Clear Aquarium Fish Tanks by Samantha Carlisle

This pre-filter is both good and bad. It is of course thinner than a sponge. It works well in my small 5 gallon shrimp tank - this filter has a fairly low flow rate initially. But in my 20 gallon tank it slows the flow and has a suction effect that affects the functionality of the filter. The good thing about this product is that it has no hole. I wish this company would offer a Courser sponge pre-filter! No one seems to understand the importance of closing an ending anymore.