Water with Green Tint, any ideas

I am having a tough problem with the pool this year. I have been using the BBB method for several years with no problem. This year the pool has had a green tint. I thought it was an algea, so i shocked. Kept shock around 15 to 20 ppm for 7 days with no improvement in the green tint.
I then began to suspect metals in the water. So i tried a metal remover from the local pool store. Brought the ph down, let the chlorine go to zero, as instructed by product and added to pool. Sure enough after a couple of days i had a non-green tinted pool, but you could see a bit of haze in the water, i can live with that. Brought the ph back up, 7.6, and added Chlorine, normally keep around 3ppm, and 2 days later the green tint is back.
The pool isn't cloudy, or slimey sided, just tinited green. I did the over night chlorine check and i lose about 0.5ppm. There is a heater attached and i am wondering if the manifold from that could be leaching metal into the pool.

Its a 33000 gal inground, with vinyl liner. This mornings readings

PH 7.6
FC 2.5
CC 0.5
ALK 110

Anything i'm missing?

It does sound like metals. Take your ph down to 7.2. The water may have clouded from the metal remover. Keep your filter running 24/7 - if the water does not turn blue, you may need a little more metal remover. Let us know how you do.

You may want to get a copper test kit--it's a drop test available from Taylor or one of their on-line dealers.