The APCFGR21 diatomaceous earth pool filter replacement grids feature a reinforced center core for increased durability. All of the APC DE grids use a 100% polypropylene cloth with an excellent resistance to acids, alkalis, mildew and rot. This cloth is stitched with a chemical resistant string that is then sonic welded to prevent any tearing or fraying.
- Measurements: 19.63 x 10.75 inches
- 18 square feet
- Collar has a single notch and is covered with an adapter