I was also having water clarity problems and out some and 100g pouch of Purigen in my filter and it did wonders. Give it 36-48 hours to work.

Nice thing is that it is also rechargable.

Andrew

Carbon needs to be replaced every month otherwise it would just release the impurities it has adsorbed.

Here's a pic of a sock: http://www.jlaquatics.com/phpstore/s...ID=pm-fb10016r

They're made of an industrial nylon-like material -pretty robust. I'd agree that I wouldn't wash them in a machine but they're not super hard to clean. Well worth the effort !