Yuck, yuck, yuck!!!!!!

If it were my pool, I'd shock the pool and hold the chlorine high for several days! Mostly to get rid of the 'ick factor' but it certainly won't hurt anything. I don't know what your CYA reading is but a chlorine reading of 2ppm isn't gonna do it for me!

Don't know how to stop them from getting in.

Yuck, yuck, yuck!!!