Hi there,

I am the owner of a relatively small, indoor commercial pool. Our pool is 25ft. x 50ft. We keep the pool at 92 degrees. Our pH is at 7.4 and our FC is at 1.5. Our CC is roughly .5. We do have a high bather load (approximately 120 people per day.) Recently, some people have mentioned that the pool is causing them itching/irritation after prolonged exposure to the water. I am wondering about adding a small amount, say 20 ppm of CYA to the pool to help act as a buffer on our active chlorine. When the pool was first built, the contractor and the guy who installed the equipment said don't use CYA. A CPO instructor also said don't use CYA. Also, what I have read online mostly says don't use CYA indoors. This seems to be because the CYA is mostly intended to shield the chlorine from UV rays, which are not present in indoor pools. However, on a different forum, several people indicated that it would be okay to use a small amount of CYA in order to lower the active chlorine, thus preventing the irritation/itching that some bathers have mentioned.

Does anyone have any info regarding the use of CYA in indoor pools?