I'm flipping a house with a 20,000 gallon in-ground pool with a vinyl liner. The liner had/has yellowish mottling throughout. I used Jack's Magic Stain ID Kit and the solution was Solution #1 (Jack's Magic Iron, Cobalt, and Spot Etching). I used the product and the next day the stains were - like magic - gone! Since the chlorine was just below 1ppm for the stain treatment, I started with 5 gallons of liquid chlorine the first day and 5 gallons the day after that (which was today). Well, by this afternoon I noticed that the stains were back, albeit to a slightly lesser degree, AND the water had taken an a slight greenish hue. So, this morning the liner was clean and the water was blue, but in a matter of one afternoon the stains came back and the water was greening.
I should note that, like an idiot, I didn't add a sequestrant so I understand why the stains are back, but why the greenish water?
Do I need to bite the bullet and start the process over with the Jack's Magic, or is there something else I can buy that would be cheaper and just as effective? I'm trying to get this pool looking good ASAP, as I'm listing the house for sale!
Im not at the house right now, so I don't have the water specs to post, but they were all within the required range for the Jack's Magic Stain ID.