First, let me say I've been using TFP since the pool was installed. Using poolmath spreadsheet with following settings
FC 11
pH 7.5 ( usually climbs due to waterfall, add acid weekly to reduce TA and pH)
TA 60
CYA 70
CH 300 (has been testing over 500, but comments here say to ignore)
Salt 3400
We have SWG installed. Couple months ago the FC had climbed to about 17 so we turned it off to let it drop in the cooler weather.
In our 3 years of maintaining pool we've ALWAYS been in the green on CSI, test weekly, only had 1 algae blum in first year, that was last time we SLAMmed.
We developed some staining, a rusty greenish color. I tried vitamin C, but evidently not correctly. Hired a 'stain guru' from the area, and he poured L-Ascorbic Acid Powder over the stains for 3 days, and they are gone.
Now he advises our chemical balance (and MA method of adding) likely were source of issue.
Regarding MA, we add weekly to reduce the TA. We pour in front of the only wall return we have, which is in shallow end. That's area where stains started. Also advised to add acid in the deep end. When we add CYA we put the bag in front of the wall return in shallow end as well.
He is recommending
pH 7.2 - 7.8
TA 90-110
CH 300
CYA 50
FC 1-5
Salt 3200
His numbers fly in the face of what we have been doing, but wondering if our balance was off so far it caused the staining?
I'd appreciate any input. Thanks so much.
FC 11
pH 7.5 ( usually climbs due to waterfall, add acid weekly to reduce TA and pH)
TA 60
CYA 70
CH 300 (has been testing over 500, but comments here say to ignore)
Salt 3400
We have SWG installed. Couple months ago the FC had climbed to about 17 so we turned it off to let it drop in the cooler weather.
In our 3 years of maintaining pool we've ALWAYS been in the green on CSI, test weekly, only had 1 algae blum in first year, that was last time we SLAMmed.
We developed some staining, a rusty greenish color. I tried vitamin C, but evidently not correctly. Hired a 'stain guru' from the area, and he poured L-Ascorbic Acid Powder over the stains for 3 days, and they are gone.
Now he advises our chemical balance (and MA method of adding) likely were source of issue.
Regarding MA, we add weekly to reduce the TA. We pour in front of the only wall return we have, which is in shallow end. That's area where stains started. Also advised to add acid in the deep end. When we add CYA we put the bag in front of the wall return in shallow end as well.
He is recommending
pH 7.2 - 7.8
TA 90-110
CH 300
CYA 50
FC 1-5
Salt 3200
His numbers fly in the face of what we have been doing, but wondering if our balance was off so far it caused the staining?
I'd appreciate any input. Thanks so much.