Will this work?

[PoolDoc]

I imagine you are going to see either an immediate effect, or no effect. The chemicals that have been in both the old and the new Stain Free aren't chlorine compatible. So, once it's fully dissolved, chlorine breaks it down.

So . . . if you have an adequate chlorine level, you can swim now . . . but your Stain Free is gone, or soon will be.

To LIFT the stains, without having to shut the pool down is tricky. Read this thread to get a handle on what is likely to be involved in really cleaning up your pool: http://www.poolforum.com/pf2/showthread.php?15092

Meanwhile, if you do these things, it will tend to gradually lift the stains:

• Maintain pH levels in the 7.0 - 7.4 range, ratther than higher.
• Dose with an HEDP product every 2 weeks:

  20% KemTek HEDP @ Amazon

• Do NOT over clean your filter. Let it run till you see a 5 - 8 psi increase over clean pressure (or 2 - 3 psi increase, on low)
• Brush regularly (2x week)
• Consider using CuLator, with skimmer socks, to protect the Culator from contamination with gunk.

  1 ppm Culator, direct from Amazon
  1.5 ppm Culator, sold by Amazon, shipped from Periodic
  4 ppm Culator, sold by Amazon, shipped from Periodic
  Poolmaster 16242 Poolmaster Skimmer Basket Liner

We *think* the Culator product works, but we're not completely sure. So skip it, if you can't risk the cost. If it does work, it's the only sure method that will 'rob' the HEDP of the metals sequested by that product and actually remove them from they pool. Filtering in the manner I told you will gradually capture the metals, but only as the HEDP breaks down and releases them.

Try that for 6 weeks. After July 4, your family will probably be less interested in swimming, and if the stains haven't lifted by then, you can go with the full treatment.