I’ve always used Morton’s, but bought 8 bags of Clorox last weekend. Dumped it Saturday evening, found yellow stains the next day. I immediately suspected trace iron in the salt, and a quick search here confirmed same.
I actually called the company that manufactures the salt that is branded as Clorox (Scotwood Industries) and to my pleasant surprise they owned the problem and advised me to submit receipts for the ascorbic acid and any additional items I would have to purchase to remedy the issue, and they’d cover my costs).
I wanted to share my solution. I ordered a pound of crystallized ascorbic acid from the source listed in the sticky, added 4
tablespoons to an old plastic water bottle that came from my local bike store, filled 2/3 with pool water and shook until dissolved. I then dove into the freshly vacuumed pool (pH 7.2, FC at 4.5, CYA 70) and squeezed the solution sparingly over the stains. They dissolved immediately with virtually no use of my sponge. Left pump run on filter overnight.
The next day the stains hadn’t returned, pH hadn’t budged, and FC only
dropped to 3.5. Three days later and the stains are still gone. I figure the amount of iron released was so nominal that no sequestrant was necessary - if the ions precipitate out they’d be so dilute after several turnovers that it wouldn’t be noticeable to the eye. I’ll advise if they do return but wanted to share my fix.
I wanted to avoid the usual protocol for removing iron stains. I wouldn’t recommend this for more significant stains but it did the trick for my episode of Clorox Pool Salt.
I actually called the company that manufactures the salt that is branded as Clorox (Scotwood Industries) and to my pleasant surprise they owned the problem and advised me to submit receipts for the ascorbic acid and any additional items I would have to purchase to remedy the issue, and they’d cover my costs).
I wanted to share my solution. I ordered a pound of crystallized ascorbic acid from the source listed in the sticky, added 4
tablespoons to an old plastic water bottle that came from my local bike store, filled 2/3 with pool water and shook until dissolved. I then dove into the freshly vacuumed pool (pH 7.2, FC at 4.5, CYA 70) and squeezed the solution sparingly over the stains. They dissolved immediately with virtually no use of my sponge. Left pump run on filter overnight.
The next day the stains hadn’t returned, pH hadn’t budged, and FC only
dropped to 3.5. Three days later and the stains are still gone. I figure the amount of iron released was so nominal that no sequestrant was necessary - if the ions precipitate out they’d be so dilute after several turnovers that it wouldn’t be noticeable to the eye. I’ll advise if they do return but wanted to share my fix.
I wanted to avoid the usual protocol for removing iron stains. I wouldn’t recommend this for more significant stains but it did the trick for my episode of Clorox Pool Salt.
on all counts! 
None of the products listed their ingredients (other than the fact that the bag contained salt) and none said anything about purity.
