Review on 🔲 Dennerle Corner Filter (5925) in Sleek Black - Efficient Aquatic Filtration by Sheri Zhao

Love it so much I have two. It's very quiet - so quiet I had to check the atomizer to make sure it was on! However, it does an excellent job of keeping the water clean. The refill cartridges that you have to buy are quite expensive since you really have to change the 'seal' about once a week. I use my own filter media (the blue/white one sold by Revain) and just pop the filter into a used cartridge (saves money). I can't afford to buy brand new replacement filters so that suits me.