TC = FC . . . after a while, if there's sun and if you keep the chlorine high enough.
Also, if TC remains unchanged overnight then it's probably FC (ie, CC = 0 or close to it => TC = FC + CC)
However, to fully test the water's chlorine levels, the FAS-DPD test is the ONLY accurate test that covers the range from 0 - 50 ppm.
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