Overstabilization: What is it?
While small levels of CYA (20 – 40 ppm) do serve a purpose in protecting chlorine from sunlight degradation, too much can cause problems. Over-stabilization (> 90 ppm) is the buildup of cyanuric acid (CYA) in swimming pool water resulting from the use of stabilized sanitizers and stabilized shock products. It significantly decreases the effectiveness of chlorine in killing germs, bacteria and algae.
hth® Pool Care offers sanitizer and shock products that are non-stabilized. These are calcium hypochlorite (cal-hypo) products, do not contain stabilizer and will not cause over-stabilization.
Symptoms of overstabilization:
High chlorine reading with algae
Adding chlorine does not get rid of algae
What is the Solution to Overstabilization? If the CYA level is > 90ppm, adjust this by partially draining some water from the pool, refilling with fresh water, balancing the water and switching to hth® non-stabilized sanitizers and shocks.