cchase, if you end up following this, I'd be interested in total cost. It looked like it was gonna be very expensive. Maybe not as expensive as a Baquacil to chlorine conversion, followed by installation of a new SWCG system. But still, really expensive.

And, a caution. Do NOT think you can go at this a little at at time. With algae, and other messes, you have to kill it outright, or you end up wasting all your work and money. The approach I described uses everything I can, within the PHMB method: fresh uncontaminated water + new filter media + 60 ppm of PHMB, peroxide, & borates, plus 4 - 6 ppm of polyquat, + metal control. The ONLY thing left is to use the standard PHMB algaecide, which might help if you add enough to make the water soapy. But, it's bitter, foamy, and unpleasant to swim in.

The other white mold / water mold cleanup products try to add a halogen (bromine) without doing a full conversion. It's a mess.

Oh, one more thing. The low initial pH, + EDTA should solubilize any metals. Using the CuLator should strip them from the water. Since metals catalyze PHMB breakdown, using the CuLator to maintain very low metal levels should make BOTH your peroxide and your PHMB last longer. You can continue to use the bag so long as it's not gummed up or discolored.

Here's what the plastic beads look like, when they have collected metal from the water: