I use these knee highs to put chemicals in for my above ground pool.  It is so much better for most chemicals to have a slow release then to just be sprinkled in your pool.  I just tie it unto my ladder (in front of the return vent) and let it slowly spread the chemicals.

I also use these knee highs to clean my pool.  I use a device that hooks to my water hose and sucks to clean the bottom of my pool.  However, the regular net bag goes not catch all the fine sediments sitting on the bottom of the pool.  So, I put on a knee high first and then put the net bag on over it to help keep it in place.  Keeps my pool looking great.