Unicel C-2699 Fill Filter Cartridge | 4 Sq. Ft. | Garden Hose Pool Fill Filter Covers & Cover Accessories When air flow drops below

When air flow drops below the required threshold — due to a blocked flue

Replace both the clip and the union nut if the groove shows signs of cracking or rounding

This model is:

The open-centre Free Flow Core keeps operating pressure down by maximizing the surface area available for filtration

and 120W models only Pentair BioShield UV System — BioShield Series 522636 Previous generation ballast for 50W

Unicel C-2699 Fill Filter Cartridge | 4 Sq. Ft. | Garden Hose Pool Fill Filter Covers & Cover Accessories When air flow drops belowThe Unicel C 2699 is a 4 sq. ft. fill filter cartridge built for one specific job: filtering source water as it enters your pool. With a built in hose thread fitting on top and a sealed bottom, this cartridge connects directly between your garden hose and the fill point no adapters, no extra fittings. The 6 oz. Reemay 2470 polyester media and 41 pleat design deliver reliable particulate capture in a compact 2 7 8" diameter body, intercepting sediment,