We just closed our 15x30 ag pool. We have a solid cover, vacuumed all debris, drained the water below the skimmer and used a skimmer plate and put a plug in the filter outlet. In years past, we would use the packets of shock in the pool prior to closing, but with our CYA so high, we just added chlorine. Our numbers are:
FC/ TC- 18.5
CYA- 100, down from 140 with partial drain.
We just stopped using the pucks in early August, so first time not using the packets of shock. Are our numbers okay for the winter? We live in Central New York, where winters can be snowy and cold.