Last year, in order to eliminate some discoloration on the walls of my pool, somebody recommended Sparkle Conquest. I used it, and quite frankly the results were spectacular.

More than a year later, I have the same discoloration in my walls. However, I have only recently learned what I was doing re: pool chemistry, and my water is now perfect (thanks to Pool School and the great mentors on this web site).

I don't want to potentially ruin the progress I have made by re-introducing this product back into my pool, but I don't know enough to say whether it does any harm. I only know that it exceeded my expectations the last time I used it, for the problem I was having.

Any advice would be appreciated.

Thanks,

It's a phosphonic acid derivitive which is the preferred sequestrant here. I don't think it'd hurt anything in your pool. Have you ever had metals in your water?

Thanks Dave. I do not know if there were any metals in the water. I don't believe I've ever tested for them. Nonetheless, Conquest really worked last time. My walls, and only my walls, look like they are rust stained.

Most likely metals and if that's the case that's why the sequestrant makes such a dramatic difference.