Except in plumbing where as supply is pressurized and return is
gravity...

Billy wrote:

"Chris" wrote in message
...
| depends on the way you look at things i guess Supply to the tank
| return from the tank
|
Ah, ok. Generally referred to, for clarity, drain or overflow(to
sump) and return (from sump to display tank). This isn't something
arbitrary, it's pretty much the standard terms.



| Anyhow the pump has a 3/4" input if i have a 3' pipe and 2 elbows
of 1
| 1/2" will this obstruct the pump?

2 elbows shouldn't create enough resistance to cause a problem. Is
this 'input to pump' all on one plane? It's not having to pump the
water up and back down or vice-versa *before* the pump input, is it?
If this is an external pump, not immersed, you should do all you can
to keep the 'inlet' as short and straight as possible to minimize the
danger of running the pump dry.




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