The only test result I currently have to share are from my own. I use the Frog chlorinating system so I don't get a chlorine reading, but I have the dial set to 4 1/2 which has done well over the past 4 years. PH is 7.6 and Total Alkalinity is 130.
The bottom of my pool vinyl liner has some irregular shaped stains. Some stains are larger in size than others. The stain color appears to be light to darker brown and brushing does not remove the spots.
Does anyone have any insight as to potention issue and the cure? Thank you.
