Hi all, I don't often need to ask ?s here, but this has me stumped.

I've recently had to work on an indoor pool (13,500 gal, liner, spillover spa) that went 'cloudy' on us. I had the 'AquaTrol' dialed down to producing 30 min/day (I've had other indoor units that were over-producing cl, so I started this on low - expecting no other problem than too much cl). When it got cloudy, I shocked with 1/2 gal 12.5% chlorine, the water cleared up. A week later, my boss went out to see the pool and it was cloudy again and showed NO cl reading on the test strip. He added 1/2 gal of 12.5%, and told them to add the other 1/2 gal the next day (he also bumped the dial on the SWCG to 20) When I went yesterday, the water had taken on a definate GREEN hue and there was a feelable 'film' on the walls. The reason I went out there wasn't for the 'green', but because one of the contractors had somehow put some iron bits into the pool, which are starting to rust (I will bring some ascorbic acid when I go back on Mon.)
My problem is that the owner 'topped off' the pool before I got there, with well water. I don't carry a metal test kit with me when I go out.
As the last peice of info, we had to put a solar cover (blue bubble) to keep evaporation down (the dehumidifier that was installed isn't working properly). I don't know if I messed something up or the well water messed things up ( I added 3# cya 2 weeks ago), also I saw LEAVES! in the pool. In short, I don't know what's happening, and would appreciate ANY help.