Unstable pH

Your pH is unstable and difficult to stabilise? 

This is due to an incorrect TA (alkalinity). The TA must be between 8° f and 14° f (80 mg/l and 140 mg/l).



  • The TA is too high: add hth®  pH MINUS
  • The TA is too low: adjust the TA with hth® ALKANAL at the beginning of the season, then once a month. Adjust it gradually by 3° f intervals (30 mg/l )