Liquid metal removers don't remove metals; they just keep the metal in a water-soluble form . . . for awhile. The ones made with HEDP are much better than the others, some of which are not at all chlorine compatible.

CuLater DOES remove DISSOLVED metals -- but not stains -- onto the plastic beads. Because of the way they work, they are very slow. You have to use them with HEDP, since the CuLator can only grab dissolved metals.

A metal removal strategy requires getting the metal off your pool surfaces and into the water, and then out of the water and onto your filter or the ground (floccing) or into the CuLator.

Precipitated metals ARE removed by your filter. The brown/orange residue is iron oxide (rust) or similar compounds.

Given that your pool is already cloudy and messy, probably what you need to do is chlorinate, filter, & vacuum till your pool water is clear and clean. Then, you can go back and remove the metals from your walls.

However, I'm puzzled by the fact that your pool is green; usually with that much chlorine, iron will turn orange. Please do all these things:

1. Send pictures to poolforum@gmail.com
2. Vacuum your pool THOROUGHLY. Clean your filter. Then, do it again.
3. Get a K-2006. You're gonna need it to clean this up.
4. Read the polyquat page . . . then get some, and start using it. It will help with the filtration AND with any algae AND let you run lower chlorine levels, while you are dealing with metals.

Testkit links:
HTH 6-Way Test Kit @ Walmart
Taylor K2006A (3/4 oz bottles) @ Amazon
Taylor K2006C (2 oz bottles) @ Amazon
The HTH kit is a good stop-gap, but it doesn't include the DPD-FAS test, which you WILL need.