Review on 🔋 AquaTech Hydro-Sponge Filter by Dana Wilson

I have 2 4 sponge hydro filters in my 150 gallon tank. One normal model, the other professional. There is no better sponge filter that I would consider. This is at the highest level. Nothing has changed since their first appearance. Instead, all follow the ati design. TO UPDATE. I have tried using an air stone and a disposable diffuser with this filter and I recommend not using them at all. Network. I would also like to point out that instead of changing the sponge every few years, I have decided to just buy a new filter rather than buying spares. Is it better to replace the entire unit after about 3 years?