"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.