Pentek - 20" x 4.5" Big Blue Empty Refillable Cartridge Plug The Unicel T-0720-50-B uses pleated

The Unicel T-0720-50-B uses pleated polyester media to capture sediment

Consistent chemistry ensures repeatable results test after test

This motor assembly works with Stenner's peristaltic pump systems commonly used for chlorine injection

Fits all standard 10-inch Big Blue filter housings with 4

Pentek - 20" x 4.5" Big Blue Empty Refillable Cartridge Plug The Unicel T-0720-50-B uses pleatedPentek 20" x 4. 5" Big Blue Empty Refillable Cartridge Custom filtration media housing for tailored water treatment solutions 20" x 4. 75" Dimensions Refillable Design Big Blue Compatible The Pentek 20" x 4. 5" Big Blue Empty Refillable Cartridge lets you build custom filtration solutions with your choice of media. Fill it with activated carbon, KDF, calcite, ion exchange resin, or specialty blends to address your specific water quality challenges.