The TT-PVC-FILTER-SOCK is a continuous â woven, seamless 100% polyester filter fabric. The Filter Sock is selected specifically for use with 1.5 inches diameter PVC slotted pipe in buried pipeline applications utilizing TraceTek TT5000 leak detection sensing cable where extra particle filtration is needed. The Filter Sock is a plush fabric tube with a 2-inch diameter and comes in a roll with a length of 100 ft (30 m).