Pond Force™ Bio-Blocks Biological Sponge Media Size:8 Cubic Feet Bulk Independent laboratory testing confirms that

Independent laboratory testing confirms that the Ultima II filter is superior to three leading bead filter brands in setup

AlphaONE filters can function for extended periods of time without slowing down

They are really easy to use: simple place into a mesh bag and drop into the pond filter

and is safe for fish and wildlife

High surface area and flowrate for efficient filtration -- you don't need a very large pump

Pond Force™ Bio-Blocks Biological Sponge Media Size:8 Cubic Feet Bulk Independent laboratory testing confirms thatPond Force Bio Blocks polyester sponge blocks provide an ideal environment for the cultivation of beneficial bacteria. With over 500 square feet of surface area per cubic foot of Bio Blocks, bacteria will have plenty of room to grow and thrive. "1 Cubic Foot" quantity comes in 20" x 30" mesh bag "8 Cubic Feet" bulk quantity comes loose in box