I'm sure everyone's sick of hearing about CYA problems long since, so I will be brief:
I'm getting reverse osmosis performed today and have switched to sodium hypo for chlorination this past weekend (installed a Liquidator) from trichlor. I've been down this road with high CYA before and did a full water replacement on our 26.5k plaster pool/spa about 5 years ago. Anyway, CYA is again off the charts and I felt reverse osmosis was the way to go.
So, after the procedure is performed I'm very concerned about the initial load of CYA. The plaster in our pool is really old--at least 15 years, maybe original (22 years); tri-chlor has always been the primary chlorine source. That being said I read in threads on this forum years ago that CYA can leach out of old plaster over time. We're in Texas and have long hot summers. Has anyone found CYA to leach out of plaster in appreciable amounts? I'm trying to determine an initial amount to load the pool with CYA and I don't want to get back in the same boat I'm in now with off-the-charts stabilizer levels...thoughts?