Drain lines...

[Mugwump]

..you folks with water change setups, what size pvc d0 you use?....1 1/2"...2" 

[BillT]

Supply lines: final branches 1/2" pvc
Drain lines: 2" ABS (1 1/2" would work fine but 2" is more available, fittings easier to find in that size).

[Mugwump]

Supply lines: final branches 1/2" pvc
Drain lines: 2" ABS (1 1/2" would work fine but 2" is more available, fittings easier to find in that size).

..thanks, Bill...

[LizStreithorst]

I just use 1" but it's because my pump is so powerful that if I were to use a larger diameter PVC the water would drain too fast.  Every tank wound be half empty even before I was finished vacuuming the bottoms.