Smallworld SWF-1 Cartridges

For carefree maintenance, healthy fish, and crystal-clear water. Authentic carbon/zeolite/foam replacement cartridges for all Penn Plax and Nature's Playland Smallworld filters. (SWF-1)

Top quality zeolites eliminate ammonia, which is the number one killer of fish. Contains top quality carbon that clears unsightly discoloration and removes harmful gases and odors.

Quick, easy, and disposable. Each snap-in cartridge measures approximately 4-1/4" x 1-3/8" x 1". Two cartridges per package.