Me too. I just opened my above-ground pool last weekend and had a ton of worms. However, I did not cover my pool for the winter, so I thought maybe some birds just dropped them in. I have to say that this was the easiest pool opening ever. It took my husband and me less than one hour. Our pool was dirty, but no algae. I tested the pool and it was great. No more dirty scummy winter pool cover to clean!