Pentair System:3 S7M400 Small Inner Sediment Filter Cartridge - 136 Square Feet fitting-type_Street Ell - 90 Degree this test is important for

this test is important for you

including exterior concrete surfaces

The test strips are dip-n-read which produce instant results

A great economical tool for pool service professionals

Pentair System:3 S7M400 Small Inner Sediment Filter Cartridge - 136 Square Feet fitting-type_Street Ell - 90 Degree this test is important forThe Pentair 25021 0223S Cartridge Filter Element for System 3 S7M400 Filters has a media area of 136 Square Feet and is made of superior reinforced polyester pleated material with polyurethane end caps. Pentair reusable cartridge filter elements provide a high degree of water clarity and longer filter cycles. To maintain your pool water cleanliness and clarity, Pentair genuine replacement cartridge elements are the number one choice in cartridge