Stains from adding salt???

[STxFarmer]

First time this has ever happened but added 2 bags of salt to my pool 2 days ago and now have stains on the plaster. This is the first time I have ever seen a stain from salt in 15+ years of owning a salt water pool. Wonder if Clorox Pool Salt was the wrong formulation or something. Any ideas?

This plaster is about 3 months old and didn't have any stains from adding 10 bags previously since it was replastered

Yard got mowed yesterday so please ignore all of the grass clipping in the pool

 

[JamesW]

Clorox salt is known to contain iron and to cause iron stains.

 

[JamesW]

Google search results

www.troublefreepool.com

 

[STxFarmer]

Well that just sux They were out of the normal salt I use so this is what they had

 

[mknauss]

Clorox Pool Salt

Salt - Further Reading

www.troublefreepool.com

 

[JamesW]

Clorox Pool Salt has been reported by multiple members to stain pools.

Morton's Pool Salt has also been reported to have some bad batches with dirt that caused staining.

Clorox Pool Salt

Instant Stain

I don't have current test results yet, but hope someone can point out what possible interactions may have resulted in this. I don't close the pool for the Winter, but other than checking salt now and then I just let it run and verify balance of things before starting to use it again. Yesterday...

www.troublefreepool.com

 

[JoyfulNoise]

Salt is a mined/manufactured product that is sold on the wholesale markets by the tonnage. It then gets shipped to finishers/suppliers that bag it up and make any necessary chemical additions. It is then sold into the distribution market where it is supplied to retail customers. Clorox, Morton’s, Diamond, etc, etc, simply license their name to be used on the finished products. So if there’s a “bad batch” or a chemical additive that causes problems, the labeled company will have no clue. They’ll simply just try to make it right by offering you a rebate or coupon to cover the cost of the defective product.

It sucks but salt is a naturally derived product and so it is going to have impurities.

 

[mgtfp]

You can try spot treating with a vitamin C tablet. If that was just a one-off dose of iron, then it's probably not going to cause further issues once the iron is dissolved in the pool water.