Overflow return question

[pstanley]

Is it safe to assume that the GPH ratings that are given to overflow boxes are based on the sumps sitting directly below the aquarium? I am concerned about my horizontal runs (One of 10' and two of 2'). When I am running the PVC from the overflow to the sump, should I stick to horizontal pieces and 90 degree bends to get it down to sump level or somehow try to angle the return all the way from the overflow box to the sump (to eliminate the horizontal runs)? Would it be better to have the sump sitting directly on the floor (in another room) to put more distance between the DT waterline and the sump? Originally I had planned on raising the sump up so it was only a foot or two below the DT waterline to decrease head pressure for my return pump but now I am not so sure.

 

[snakeblitz33]

Ten foot horizontal run? I believe traditional plumbing code calls for a 6" drop for every 8ft of run that way there is some ability for it to drain properly. For the horizontal run i would drop it by 7" and use a flex hose to connect it to the sump.
I would also keep the sump near floor level for easy maintenance, but some people put them on low tables and have emergency overflows on them as well as drain lines to empty a good portion of their sumps. Something to think about since you are doing a custom job.

 

[2quills]

It's 1/4" drop per linear foot for sanitary plumbing.
Yes, I would come strait down out of the overflow box to basically sump level. Might as well use gravity to your advantage before you make the horizontal run.

 

[saxman]

I'd definitely use corrugated "pool drain" hose for your drain line(s). FWIW, our 210's sump is housed outside the house in its own little equipment shed, so the run is about 10-15 feet or so. It drops a bit vertically, then flexes and goes thru the wall, into the shed, then makes a right turn, to the far end of the sump. Be sure to use the hose with the "smooth" ID to cut down on friction.

 

[pstanley]

Hmmm....just when I think I have everything figured out. Well it appears that I am going to have to either 1) angle it down all the way from the overflow box to the sump (where possible), 2) break up the long runs by stepping down using extra 90 degree bends, or 3) use flexible hose (which I don't want to do since I already purchased the PVC). I will also need to keep the sump on the floor to take advantage of the height difference. Snake - I actually thought about sitting the whole sump in a kiddie pool in case of overflows