Vinyl hose question

[Reef_Geek]

maybe it's airborne stuff that gets onto your plastic gear? like when you cook bacon, things in the house has a greasy feel to the touch... maybe something is coating your plastic gear over time from something going on in the house?

mmm.... bacon....

[gregzz4]

Hey Greg, have you ever tried cleaning out both barrels to narrow down where the film is coming from ?
Maybe it's the barrel itself ???
Fill the second unit from the first with a jug or something to rule out the hose and pump setup