i left a vitamin c tablet on the stain for 30 minutes and when i came back the stain was bigger and a darker brown. what does that mean and how do i fix that now.
vitamin C test for staining
- Thread starter tomypasta
- Start date
- Nov 12, 2017
- 12,657
- Pool Size
- 12300
- Surface
- Plaster
- Chlorine
- Salt Water Generator
- SWG Type
- Pentair Intellichlor IC-40
Hi ya! Welcome to TFP.
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Pool School - Read This BEFORE You Post
You'll get a better answer, faster, too, if the experts here have more to go on. Can you fill in your signature, please? Here's what they'll be looking for:
Pool School - Read This BEFORE You Post
- May 23, 2015
- 25,713
- Pool Size
- 16000
- Surface
- Plaster
- Chlorine
- Salt Water Generator
- SWG Type
- Pentair Intellichlor IC-60
It’s likely a copper stain. If it starts off as light brown in color or tan and then, upon exposure to ascorbic or citric acid, it gets darker brown or black, then it’s likely copper. Unlike iron which has it’s solubility in water enhanced by the presence of ascorbate ions, copper actually oxidizes faster in the presence of ascorbate. There are other organic acids that are better at dissolving copper, namely sulfamic acid.
To be 100% sure, you should get a trichlor puck or put some dichlor in a sock and let it sit on the stain for a few minutes (NOT 30 mins) to see if it lightens. Using a potent chlorine source near a stain helps to differentiate between organic/biological and metal staining.
To be 100% sure, you should get a trichlor puck or put some dichlor in a sock and let it sit on the stain for a few minutes (NOT 30 mins) to see if it lightens. Using a potent chlorine source near a stain helps to differentiate between organic/biological and metal staining.
What pool type do you have (vinyl, concrete or fiberglass)?
Do you have pictures of the pool?
Do you have pictures of the pool?
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