Start by backwashing your filter to remove any dirt or contaminants. Also, make sure the skimmer is clean from all chemical residue or debris.
Test Water Levels
Next, test and adjust the level of free available chlorine to 1 – 4 parts per million (ppm). Then, measure the cyanuric acid (CYA) concentration. The ideal range is between 20 – 40 ppm.
Add HTH® Stabilizer
If CYA levels are below 20 ppm, then add HTH® Stabilizer directly to the skimmer. Wait for the granules to dissolve before adding any additional pool products. Leave the circulation pump running and do not backwash for at least 48 hours.