provided the total chlorine is higher than the free chlorine. Apply the formula F - T = C. Collect a pool water sample in a cup dipped at least 18 inches into the water. Dip your test strip into ...

16 in 1 Premium Water Test Kit - $13 (was $16) Umlecoa 16-in-1 water test strips are versatile and can be used for various water inspections, including drinking water, pools, hot tubs, spas, ponds ...

combined and total chlorine: test strips, a chlorine test kit or a digital chlorine sensor. Litmus style chlorine test strips change color when they contact the water, indicating the approximate ...