Fluval "U" Poly/Carbon Cartridges
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- Designed to fit U2, U3, and U4 Underwater Filters
- Polyester side filters out fine debris and contaminants for crystal clear water
- Carbon side filters out harmful liquid substances, discolorations and odors
- Porous surface of both sides provides an environment for beneficial bacteria to carry out natural biological filtration
- Custom fit to prevent water bypass and improve filtration efficiency
- For freshwater, saltwater, or reptile environments
The Fluval U Poly/Carbon Cartridges feature two sides for effective mechanical and chemical filtration. These filter cartridges are secifically designed for Fluval U2, U3, and U4 Underwater Filters.
- Rinse thoroughly before use.
- Replace every 2 - 4 weeks, or when flow rate is noticeably reduced.
- Only replace one cartridge at a time. NEVER replace both cartridges at the same time. By replacing one at a time, you will maintain a healthy level of beneficial bacteria (which is very important for filtration).