My t/b's have a 10mm banjo on them so i was planning on doing the whole system at 10mm, but im feeding a swirl pot with a facet solid state pump and i can only seem to find filters for these in 8mm. Will it be ok to go 8mm tank to low press pump, then 8 0r 10mm? LP to swirl pot, then 10 mm HP pump to t/b's. Or is there somewher i can get a screw in filter for the facet with a 10mm hose tail? Thanks

8mm is more than enough for the vast majority of set-ups. 8mm will have more resistance than 10mm but it's really not a problem unless you're installing the worlds most thirsty beast under the bonnet...

Thought as much, just wasnt sure if stepping it up after the pump would cause problems. Would it be best to use 8mm after first pump too, or does it really not matter, after all the hole in the hose tail is prob only about 5mm anyway. Thanks

Wouldn't have thought it would matter one jot re the switch from 8mm to 10mm... If you're worried just do the whole thing in 8mm and have a 8-10mm reducer at the TB attachment point...