Stains in pool

[seeberger]

Hi,
Just opened our pool are are relatively new to this process. We had some stains last year, but more appeared over the winter. I dropped a few vit. c tabs on some of the stains and they came right out. The pool store tested our water and said I need to balance it before using ascorbic acid or it won't work. My concern is they want me to raise the alkalinity, which I think will also raise the pH and I thought the pH should be low for the acid to work? They also said I need to raise the calcium or hardness. Should I do all this before or after using the acid? The test results are as follows:

CYA - 70
tot. chlorine - 7
free chlorine - 7
pH - 7.3
tot. alk. - 93
adj. tot. alk. - 72
tot. hardness - 125

Any help is greatly appreciated. We live in Warrenton, VA and our pool is plaster/30,000 gallons/inground/with a DE filter. I'm not sure how long some of the stains have been there as we are the second owners.
Thanks in advance!!!,
Lisa

 

[JasonLion]

I would not raise the alkalinity, but do raise the calcium/hardness. For a plaster pool we recommend TA at 70 to 90, and CH at 250 to 350.

I would go ahead and add perhaps half or 2/3rds of the calcium now, and then do the rest later.

Have you read the topic on doing the ascorbic acid treatment?

 

[seeberger]

Thanks Jason ... will do. Thanks also for the link to the ascorbic acid topic!