Greetings- Sorry, I don't know who to direct this to. I'm a first time pool owner (10 old pool) and have a question/theory to pose based on a recent conversation with a Leslie's employee:
My CYA was off the charts so I drained appox 60-70%, routed through the deep end drains and out via garden hose connected to my spa fountain head. Refilled and took a sample into Leslie's to get CYA re-tested and learned it was still very high (150+). The Leslie's employee told me to use a submersible pump and re-drain from the top down because that's where the CYA accumulates.
Does CYA accumulate near the surface of the pool? If so, how deep is this layer? Also, this scenario implies that water below the 'surface zone' will have a different CYA composition and that CYA tests will be biased by how close to the surface the sample is drawn from.
Thanks for any insight you can provide.