I have been using the commercial grade PB for 2 months and have been very happy with the results. I do not find the need to push down on the unit once I put it to the bottom of the pool. I haven't seen the socks mentioned in this thread, but it is my understanding that the CG comes with the fine sediment bag. Once in a hile if I see some sediment getting through I use some cotton balls as recommended by someone on this site (Carld).

You can't go wrong with this unit.