Cut this to the size of your filter and it does a great job of trapping all manner of debris and presumably beneficial bacteria. All of my aquariums that I use this in have stable water chemistry and clear and clean water. It's also a pretty sizeable role. If you had 10-15 tanks with working filters hanging from the back, I think this stuff would last you for years to come!
Humidifier / air purifier "Fanline Aqua VE400" with an ionizer, with a capacity of 410 gr/h
44 Review
Sink filter Prio New Water Start Osmos OU380 white
79 Review
KEDSUM Battery Aquarium Air Pump: Ultra-Quiet Rechargeable Fish Aerator with Dual Outlets - Ideal for Fish Tanks, Outdoor Fishing, Fish Transportation, and Power Outages
35 Review
Aquael Fan Filter Mikro Plus
35 Review
Mini pump Xiaomi Mijia Electric Pump 1S, plastic, black
55 Review
Greenpro Micranthemum Monte Carlo: Live Large Pearl Grass Aquatic Plant In Tissue Culture Cup For Freshwater Fish Tanks And Aquariums
49 Review
π U-BCOO Aquarium Gravel Cleaner Fish Tank: Manual Siphon for Efficient Filter Gravel Cleaning and Water Change in Tanks
22 Review
Steam cleaner Deerma Deerma DEM-ZQ610 EU, white/red
68 Review