For CYA test, what is the recommended amount of mixing time after a partial drain and fill. In my case, I drained approximately 900 gallons on a 17000 gal pool (~ 5%) and refilled with city water.
I tested the following day but the total run time of the pumps during that period before testing probably was less than 8 hours. I went from a previous reading of 60ppm to now reading 40ppm.
So either my previous reading was too high or my current reading too low. There's been a little rain water here and there but nothing that significantly altered the pool volume. Water is crystal clear and sparkly.
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