Number6,

just the fact that you're able to test 3 ppm at the return and 0 - 0.5 in the pool is evidence that your cell is producing chlorine,
make sure your cell is not scaled, as your TA is a little on the high side. 80-100 ppm would be much better.
As Waterbear suggests, add chlorine to get rid of your algae problem first. Ensure that you're able to maintain a FC in the pool, then you should be back to normal. With all this rain, you're either going to have to increase your system's output, or suppliment with bleach or tabs.