The pipe from the pump to the pond could be plumbed with the smaller pipe, 2
inch, since it will be on the pressure side of the pump. On the vacuum side
of the pump, the pipe friction will severely reduce the output of the pump,
since they are designed to push, not pull water. The piece from the main
pond to the veggie filter will only have gravity working to push or pull
water. If the pipe size is not sufficient, then the drawdown of the veggie
filter will be extreme to try to keep the volume of water flowing from the
pond to the veggie filter at the same rate as the water from the pump to the
pond.
--
RichToyBox
http://www.geocities.com/richtoybox/pondintro.html


"BenignVanilla" wrote in
message ...
I have been thinking today about our conversation about pipe sizes a week
or
so ago, and I have decided I am still confused. If most pumps have 2-inch
fittings, what good does it do to have 4-inch pipe everywhere else? Isn't
the 2-inch connection the limiting factor?

My pond will have a bottom drain and a skimmer that will empty into a VF.
A
pump in a pump house will pull water from the VF and dump it back into the
main pond. Currently my plan is to use 4-inch pipe from skimmer/bottom
drain
to VF, 4-inch pipe from VF to pump house, and 4-inch pipe as a return to
the
pond. I have not selected my pump yet, so I am not sure what I will need
there.

Any thoughts?

--
BenignVanilla
tibetanbeefgarden.com
x-no-archive: yes

Remove MY SPLEEN to email me.