cya help

[waterbear]

I was wondering if there were any other methods of reducing CYA besides drain-fill. Previous use of tri-chlor pucks have created a high concentration. I've now switched to using bleach.

I have done some net searches & saw a patent for using melamine, but wondered what else could be done. How long does it take for CYA to degrade or reduce naturally?

You can buy CYA reducer (melamine) for about $50 or so a gal. from many pool stores. (One gal will remove about 20 ppm CYA from 10000 gal by precipitation) It takes more than one gallon to treat the average pool! It is cheaper to drain and refill and the melamine will make the pool like milk. If you have ever tested for CYA the liquid reagent is melamine! Do you want your whole pool looking like that?

Drain and fill ( or several partial drain and refills) until the CYA level is withing range is best...then switch to unstaiblzed chlorine and you won't have the problem again!