Unicel C-6900-4 Quad DE Filter Cartridge Set 25 Sq Ft CMP Excess energy is stored in

Excess energy is stored in the built-in battery for nighttime or low-light operation

and transitions

Smooth handle rotation without binding

or slightly cloudy

Unicel C-6900-4 Quad DE Filter Cartridge Set 25 Sq Ft CMP Excess energy is stored inThe C 6900 4 Quad D. E. Replacement Cartridge Set is a complete 4 pack of 25 square foot cartridges (100 sq. ft. total) designed to restore proper filtration performance in Pentair Quad D. E. 100 and Hayward DE250E pool filter systems. These cartridges act as the structural filtration elements that are coated with D. E. powder or D. E. alternatives to deliver exceptionally fine filtration. Unlike standard cartridge filters, Quad D. E. systems rely on