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TxFlyGuy, I just tried your no drain method on my pool. I brought the pH down using 4 gallons of acid on my 16,000 gallon pool and added scaletec yesterday. I brushed today but didn't really notice a difference. Did you notice a difference after the first day? Or was it not until after 48...

Thanks for posting this. I'm going to give it a try on my pool too. When did you add the Scaletec? Immediately after adding the MA or did you wait for the MA to circulate and pH to go down before adding the Scaletec?

Yes, I'm guilty of letting my pH get as high is 8.0 from time to time. I usually hovers around 7.6-7.8 but some times I'll skip adding acid one week and next week I'll check and it's at 8.0. I tried the vitamin c test and it looks like it lightened the stain. Looks like I have an issue with...

Thanks for all the responses. I just went to have my water tested at the pool store again today. Here are the results: FAC - 3.0 pH - 7.6 TA - 90 CYA - 38 Calcium Hardness - 450 TDS - 1200 Copper/Iron - .3 Phosphates - 200 Could the stains be due to calcium buildup? The plaster is a...

Got it, my problem is all my tests are ok done by me and pool store and I still have the dirt staining.

How do I test stains?

Thanks for the reply! I've posted some pics. If it is an organic stain how do I use chlorine to remove it. Are you suggesting some how spot treating it with chlorine?

I moved into my house 2 years ago and over the last two years I've noticed my pool plaster now has more and more dirt stains. The stains are on the bottom of pool, steps, and spa seats. There doesn't seem to be dirt stains on the walls. I brush once a week but for some reason there seems to...