I get mine from a site online which I will post when I remember it. But I pay only 1.50 per filter sock 100 micron. they sell different kinds of materials and sizes. I usually buy 30 at a time considering I use 5 filter socks at a time. 4 for the returns and 1 for the skimmer return. i usually get the garden hose with a spicket on it and clean both inside and outside of them first then run them through the washer when my moms not looking. she would probably kick me out if she only knew. pops knows and he just laughs about it. like he does with all my fish stuff. he loves it. she hates it.