I am in a vicious circle with ascorbic acid to remove brown staining. Brought chlorine levels to zero applied 1.5lbs of ascorbic acid to my 24,000 gallon vinyl lined pool. This removed most of the stains in an hour. Applied another 1.5lbs and viola! all stains gone. Pool was clear and bright! For three weeks everything was great keeping a FC of 2ppm for this time period with 42 degree water here in Arkansas. Then the rains came and he pool went green. Shocked the pool to a FC of 16. Brown staining has returned. I have placed 1.5 gallons of GLB sequestrant to try and remove the stains to no avail. I have a sparkling clear water but all the sides, stairs and bottom are now brown. Do a start over with AA? Need some advise please.
Test results per TFP Test Kit:
FC 6 ppm
PH 7.2
TA 60
CH 100 vinyl
CYA 70
Salt 3800 ppm
Water Temp is now 52 degrees
Test results per TFP Test Kit:
FC 6 ppm
PH 7.2
TA 60
CH 100 vinyl
CYA 70
Salt 3800 ppm
Water Temp is now 52 degrees