Quote Originally Posted by CarlD
it's called the Slime Bag, not that other...

It's not the same as skimmer socks (which are great), but it's supposed to be fantastic, as good at filtering as a robotic cleaner's bag. But it's very pricey. I find I don't need it--I use skimmer socks, and add DE to my sand filter and that keeps my water sparkling.
ME BAD Carl is right! Slime bag is a micron filtration bag. It filters about as fine as a DE filter.