I had the same problem and tried everything to get rid of them.....ended up draining entire pool and then scrubbing with diluted bleach, rinsing, then re-filling again and problem free 3 weeks later.
i get tons of black worms about 1 1/2 " long and i think they come from a very large pine tree............when the wind blows hard, and it rains lots, and needles begin to turn red and fall.........the next day the bottom of the pool literally has hundreds (all dead) and i vacuum them up and empty my skimmer basket............gross...........i would love to cut down the tree because of this problem, but of course, the tree looks nice??????
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