I have a 31000 gallon white plaster pool. Started it brand new 45 days ago. It took 52 hours to fill it up and once it got going it had some stains left on the floor and the walls. After a a month, the pool builder said we should empty the pool, do a light acid wash. We did that and then filled the pool. In our city, after 52 hours, the pool was pretty green. I shocked the pool to remove the organics and after 2 days, the water was and has stayed clear as I balanced it. However, left behind are some light greenish brown stains on the walls and floor(it's worse than before). I have scrubbed, vacuumed, shocked, etc and nothing has changed. I did use Jacks magic stain ID kit and the Jacks Magic Solution #2 worked great in less than 30 seconds to remove the stain on contact. Seems like a no brainer to execute the solution #2 process, but I have read folks have concerns about the phospates added from Jacks Magic. Since it's proprietary I don't know what's in the solution. My plaster guy said he would do a acid wash without draining the pool if I wanted him to before I spent the money on Jacks. I am concerned about re-acid washing the plaster again 45 days after it was plastered. Concerned about weakening the plaster long term.
In talking with the Jacks magic guy he thinks that this is likely a calcium scale which is why the #2 solution worked.
Anybody have a similar situation where you used the #2 solution?
Anyone know what is really in the #2 solution?
Would you try an acid wash first before Jack's, or is there something else I should be considering.