Vitamin C Powder is a miracle worker

[markayash]

After I had my pool re plastered and new stone coping I had Iron stains ( never had them before ) that I suspect came from the stone. They had to acid wash the plaster and while it was drained we had a lot of rain and the stains appeared. I did a normal Vitamin C treatment and it helped clear up 80% of them.

This winter I had already decided to drain 3/4 of my pool to lower CYA and I start over on converting to salt..
With the pool drained 1/2 way ( approx 9000 gal ) I added 10 pounds of Vit C powder and let it sit for a couple days before dropping it down more and refilling..It looks like a totally new pool now..Before it had brown spots I had decided to just live with

 

[Texas Splash]

Glad to hear it worked. Next is to confirm the source of the iron. I'm not so sure about the stone. If you fill from a well, that would be #1. Some municipalities also have a bit of iron their water supplies. Do you ever see orange stains on white shirts or anything? Toilets or plumbing fixtures with stains? Might be something to watch.

 

[JoyfulNoise]

so you added a VERY HIGH load of vitamin C into the water - 10lbs in 9000 gallons is ~130ppm. 2-4ppm is typically sufficient to remove stains. With that much ascorbic acid in the water, even a partial drain followed by dilution is going to leave behind a good amount of the stuff. Vitamin C neutralizes chlorine (or vice versa depending on how you want to look at it). So before you turn on the SWG, I suggest you get the FC up and holding using liquid chlorine. You may even want to SLAM the new water first to ensure all of the vitamin C is gone. Then turn on the SWG.

 

[markayash]

thanks, that might explain why its going through liquid chlorine while the water is cold. But the quartz looks great.