They are Chironomid midges also known are red worm larvae, and they are very had to get rid of.
move your swimming pool
You buy a swimming pool net and scoop them out.
in a swimming pool
Oh, my goodness. I'm a social worker and not a physician. If you are the one with the worms, stop asking questions and get you your physician right away. If the little visitors are living with a friend, tell you friend to get to a physician immediately. Who cares where they came from? Get rid of them!
You can use a black hole
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Empty the pool out and fill it with soil. OR Use chlorine.
Add more chlorine
How can I get rid of rust colored stains in my salt water pool. It is only in the shallow end?
drain, scrub and refill..