check out mcmasters.com....they sell filter socks for dirt cheap when you buy 10+. Easy too re-use as well. I toss my in the washing machine(no soap or bleach), run one cycle. Turn inside out....run again. Turn back to normal and run one more time. SPin a few times and they are as good as new. Its nice having a bunch. I toss the old ones in a bucket outside and when i have all but the one running in the sump dirty I run my load of filter socks. I spent a little over $40 on 10 and they are going on year 2