No matter how high my chlorine level is, I seem to always have at least 1 sometimes 2-3 of these things. I scoop them out and they get back in. Haven't had algae since spring so I don't know what they are eating or why they decide my pool is a better home than the pond! I am afraid to try dish soap, my pool is on the small side so that could be disastrous. I once bought an off brand of bleach and it caused a small amount of foaming, must have had some kind of surfectant (sp) in it, I wish I remembered where I got it, I'd start using it.