Minnesota pool inspectors rules limit CYA to 100 ppm. Above that you have to partially drain pool and add water to reduce CYA. We currently use Trichloro 3" pucks in a feeder to conveniently set chlorine level, but near the end of the season we are close to 100 ppm CYA.
My question..how about adding Cal Hypo along with using Trichloro so as to slow the build up of CYA. If this is a successful approach it would be easy to implement. Does the CYA from the Trichloro provide some benefit to the chlorine use from the Cal Hypo chlorine?
Our season is 4 months. Seems like it would be a shame to have to drain down by half just to finish the 4th month.