My sister and I were cleaning out our spa when we found thousands of these worms. We drained all the water into the back yard, now I'm not sure if we should have done that. I want to make sure these are not parasites and if they are should I spray bleach all over the backyard? This morning I poured bleach in the rest of the water in the spa and these things started swimming to the top of the water; 30 mins later they are still swimming.

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