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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.