I am just done SLAMming my pool successfully (thank you for this information) only to be left with this unsightly view (see attachment). You can see a triangle forming from the edge of the pool. The triangle points to the return which tells me that whatever deposited there was being prevented by the constant flow of water. I tried brushing hard several times with an algae brush but it won't go away.
My current chemistry is as follows:
CH: 597 (High due to source water. Already backwashed several times while SLAMming)
CYA: 17 (low because I did not want to increase until done SLAMming)
Salt: 5200 (High because I thought I had too little. Was using test strips and now using Taylor)
Any thoughts? If an Acid Bath would resolve my problem, could you please post a link to how to perform it. I read about the Acid Bath regarding others who have had stains but could not find a thread explaining how to do it.
Thank you in advance.