Aquachek Red 4-In-1 Test Strips, 50 Strips | 521252A FG1006 confirm your filter uses a

confirm your filter uses a 7 full + 1 partial grid layout and that your existing grids measure 12" × 11"

match the part number stamped or molded on your existing core to 59053800 before ordering

Economical and won’t clog filters

this is NOT the correct replacement

Performance and fit are equivalent — always confirm by measuring your existing cartridge's length

Aquachek Red 4-In-1 Test Strips, 50 Strips | 521252A FG1006 confirm your filter uses aAquaChek Red 4 in 1 Test Strips, 50 test strips Tests for Total Bromine, pH, Total Alkalinity and Total Hardness Provides Test Results in seconds! To keep your pool at its best, test at each end at least twice a week, and test your spa before each use. Comes with complete instructions in multiple languages