Aquarium Bio Filter Media Sponge: 6pcs Foam Filter Pad Inserts for ML350 - Enhanced Filtration Efficiency Review

I have several large fountains and the net fails after about two years. It's demeaning. That and some waterproof glue and you can restore the flow of your fountain.

This work took a long time but I soaked them washed, each of these used them in my rear hanging aquatic filter, there are several Reservoirs working as filters or for larger biological media loving theses

Perfectly tailored to the size of the rod filter. Shows 3 on each side. Using 2 or 3 will prevent proper water flow, causing water to flow through the overflow channel. I use one in each compartment as a pre-filter. They're enough, of course, to create a biological load, but they still trap most of the food debris. I use different filter threads behind the sponges. This setup works well for good water flow and keeps my aquariums clean.