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Leslie's has been telling me my CYA level is off the charts and I need to drain my pool. Went to an independent pool store and they tested my water and show my CYA level at about 40, with two different test kits. So who do I believe? Independent store is where I bought my current liner...

What is the purpose of the "rinse" setting of my Hayward Multiport Valve? Water exits the Waste port, but what is the difference between the "Rinse" and "Waste" positions? Thanks in Advance.

I have been looking over the site and have been learning a lot about stains on vinyl liners. I just reopened my pool and the winter cover tore open and allowed a lot of Pine needle and pine pod/things accumulate on the bottom of the pool. vacuumed and cleared water. Water is now very clear...