Pool size 18k gallons. Jandy Aquapure700 is 3 yrs old. Unit was on 100%.
Now shocking to kill Black algae but owner has suspicions unit is not working. I thought that since I saw fine bubbles fom returns that it was working but unit is turned off and bubbles continue.
Day before we arrived here, pool co measured FC 1.5 at 5 PM and pH 7.6. Next morning at 11 AM I tested FC trace and pH 8.2+ with CYA 30.
Owner may need to consider a properly sized SWG, or adding a second unit. I have no idea of costs. Does anyone have experiance on relative costs?