I have just built a 18x36 8ft deep vinyl pool that is about 22,000 gallons. I have a Hayward SWG rated for 40k gallons. I cannot keep the pool chlorinated. The pool store has tested the pool chemistry and the SWG, all look good. I was told at one point that I have high nitrates but was never given an amount. (It is the only item that is not listed on the printout.) Another time they said it was fine and the third time it was not measured before they dumped the water. There are several large pecan trees located near the pool. Is it possible that the nitrates are coming from the pecan trees and the chlorinator can't overcome them? Or is there something else going on? Should I test the nitrates myself/how? I am running the pump 8 hrs a day from 10 am to 6pm. Chlorine coming from the returns is about 4 ppm.
Here is the latest data I have:
Once I get the chlorine under control, I plan to add borates.
Thanks for any help you can provide.