Review on 🐠 UPETTOOLS Biochemical Sponge Filter with Air Stone - Ultra-Thin Round Air Driven Clearable Bio Quiet Filter Sponge for Shrimp Nano Fish Tanks by Jake Yap

Filter works great in my 5 gallon battle tank. The bubbles are small and don't disturb the water much. Makes water crystal clear. Definitely recommended for a small pool. To update. I have 2 of them to have a backup while I'm cleaning one. The second had a crack that prevented the air stone from working. The seller was polite and refunded part of the cost. I decided to leave the cracked one for spares. I ordered a third one as a backup that I still needed. Arrived used and dirty. Rating downgraded from 5 to 2 stars. A good filter for a small aquarium, but don't use one in three.