This depends on how high your pool's pH is and the size of the pool. If you are using test strips, it's usually hard to determine exactly how high the pH level is; you just know it's high. A ...
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DIRECTIONS : Do not leave the residue in the test tube. Rinse and dry the test tube after each test. Keep the bottles upright to drip for accuracy. Take a test bed at a depth of about 450mm and ...
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1 / Clor test with DPD # 1 reagent
Pour water into the test tube as small as the horizontal line
Put 1 DPD into the tube
