You are looking atthe flow rate w/ --0-- head loss. How far up is the water
being pushed from the pump to the tank?? I personally don't think it is too
weak to push the system you're talking about, but it will not be the
greatest flow rate. If you decide to go w/ two pumps, don't go smaller then
the one you are talking about here... You don't need two filters, just two
pumps in the same sump, routed to opposite ends ofthe tank to create some
nice currents. Or you can go with one 1200+ pump to do it all, but using the
two is better for redundancy's sake...

"David Willett" wrote in message
news:3f60b6de$1@shknews01...

"SG" wrote in message
able.rogers.com...
I
was thinking of using a Hagen 901 powerhead for the return from the
sump.
It is rated at 900 gph. Is this too large?

It is too small. That powerhead is rated for 900gph at zero elevation
change. You are going to move water up several feet from the sump.

What is the gph that I want to run through my w/d? I have heard that I
need
to cycle the water 3-4 times an hour. Does that mean that I need
750-1000gph going through my w/d? That seems like an aweful lot of water
to
me. It seems to me that it would be a lot easier to run two smaller
filters
to get this volume. What size overflow tubing do I need? Is this size
determined by the size pump that I use?

Is there anything that I am totaly missing?

[snip]
Did you remember to brace the floor under the tank?

I haven't built the tank yet. I am trying to work out the specifics
first.
The house that I live in now is on a concrete slab.