GLI 18' x 40' Oval Armor Shield | 70-1840OV-BLK-160 Pool Fencing your system requires 3 cartridges

your system requires 3 cartridges for a complete service

Bottom Cap: open w/ raised ring

the FC-1977 Pool Filter Cartridge requires fewer filter replacements

Contoured shape provides easy corner and step cleaning

making them easy to spot underwater

GLI 18' x 40' Oval Armor Shield | 70-1840OV-BLK-160 Pool Fencing your system requires 3 cartridgesShape: Oval Size: 18' x 40' Armor Shield provides an important protective layer between a vinyl swimming pool liner and its sand or soil base. Unlike traditional foam padding, Armor Shield is a Polypropylene Geotextile blend that minimizes cuts and punctures to the vinyl liner caused by rocks, roots, grass and even GLASS! Armor Shield also reduces convective heat loss and provides a comfortable floor pad for the comfort of pool goers. Features and