My pool seems totally clear and has no signs of algae OTHER than the net in the leaf trap canister, where the white cloth parts of the net have become green. This is a Hayward large leaf trap, which uses a blue net with a white "handle" on it to hold when dumping it. This handle, as well as some white stitching along the net, have turned green. I was told by a pool repair guy that this was normal as long as there were no other signs of algae in the pool. He said that the leaf canister floating at the surface, along with some organic debris in it, provided a particularly algae-prone area that could still show a little green even with proper sanitation levels. I'm still not convinced, however. I can't help feeling that proper chlorine levels should wipe it out completely.
I raised the chlorine level to around 10ppm, which took several days to come back down to 4 or so. I also took the net out and tried soaking it for a little while in a solution of 1 part liquid chlorine to 3 parts water (i.e very, VERY strong chlorine.) The cloth got a bit whiter, but even this did not fully remove the green, and it just came back again after several days.
Note that through all this, my combined chlorine levels are always 0 (i.e. undetectable), so it does not appear that my chlorine is working all that hard.
Is it true that it's normal to see what I'm describing even with proper sanitation levels, or is ANY green on the net a sign of a problem?