Quote Originally Posted by alohafiberglasspools
Hi Hoogie,

But, there is another product that is nealy 100% effective at removing the stains, then keeping them away- Metal Magic by Haviland. 800-333-0400. Unlike Jack's Magic, which works some of the time, but not all of the time, because it is a sequestrant, not a remover. The first time you suprchlorinate, you destroy the protection. We've had amazing success with Metal Magic.
My builder gave me two bottles of Metal Magic for my fiberglass pool after putting one in himself. It was no more effective than Jack's purple stuff that I also used. Looking up the MSDS for both products I found that they are both phosphonic acid derivatives as are the majority of stain and metal products on the market. My problem was a bit of rust staining and some concrete that hardened on the steps of the pool from the construction phase. The staining disappeard right away but the builder is still trying to get rid of the concrete! I think his theory was the low pH caused by these types of products would help dissolve the concrete.