A few years ago I bought 100 socks from ebay and shipping wasn't that bad considering I paid about $2 per sock, size was 4" x 14". The saving was well worth the trouble if you plan on using that many. I ended up utilizing only about 30 and sold 70 after 3 months. The maintenance of using filter sock was way too high compared to the benefits so I ditched the entire idea, even thought I had filter socks at my disposal. So think twice if you choose to go this route.
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