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Filled cable, or jelly filled cable, should be used whenever a telecommunications cable is placed underground, or under the concrete slab of a building, even if the cable is in conduit. If non-filled cable is used it will eventually get water in it and be ruined.
Technicians hate working with filled cable because the fill material, similar to petroleum jelly, gets on their hands and feels yukky. Frequent clean up with shop towels helps. The temporary inconvenience of gooy hands is well worth the much longer cable life obtained by using filled cable.