(3 Pack) Fluval Filter Foam Block 404/405, 2 Blocks each
- Perfectly sized for 404, 405 and 406 Performance Canister Filters.
- Provides the first crucial stage in the aquarium water filtration process.
- Captures large particles and debris for effective mechanical filtration and enhances biological filtration.
- Custom fit to prevent bypass, they have a pore size that allows efficient water flow with less clogging for long-lasting filtration.