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Update: The LaMotte ALK test reagent was indeed bad. The expiration date is 4/2021 but still no good - must have been a “bad batch.” I have read other posts regarding bad LaMotte ALK reagent. The previous ALK test result was a constant 40. NOW, after testing with the NEW reagent today I...

Ph increased since initial post from 7.7 to 8.1. I added dry acid as recommended. This is more evidence to suggest a problem with the test reagent or testing because it is certain that enough baking soda was added ( probably more than needed which elevated ph Ibsuspect)to bring ALK in range. To...

Using the Lamotte ColorQ Pro 7 ALK test solution ( expiration date 4/21) the ALK reading from the photometer has not changed after testing 4 times over 8 hrs apart and after adding the appropriate amount of baking soda indicated by poolmath. The initial reading before adding baking soda was...

For my pool and equipment Hayward recommends CYA “30-50” AND FC “1-3”. Concerned about damaging equipment if following TFp CYA/FC chart as levels recommended there far exceed those Hayward recommendations. What about warranty issues if levels are outside recommendations? Great site.