Mega flo g.p.h. rating?

[christian36]

ihave a 90 gal. AGA,with built in overflow(reef ready).I am running a Iwaki 40RLT. Its rated for 750GPH - 3 foot head from sump. I know the mega flow is rated for 600 GPH. When i throttle the return way back so the overflow can handle the volume, the stock return is so strong,no matter how i point it, it will completely disturbe the sand bed. So what i did was take out the stock return, and made it another drain, then plumed PVC to a tee and came over the lip in two places. My question is how do people get this killer tank turnover rate of up to 10 times an hour? Not only could the overflow not handle it but the return would make for a non stop sand storm .....no?

 

[rbursek]

couple things, when you throttle your return pump you decrease flow, but you increase the velocity that the water comes out at do to back preasure. The ones running 10-20x flow I think they have drilled tanks and not using the Mega Flow system, which limits you to 6oogph each, me too. The Mag drive pumps seem to be more conducive to that system with there flow/head rates.
Bob

 

[Len]

:welcome:

You get high turnover rate with the use of powerheads, prop pumps, closed loop, etc. It's really not a good idea to have 10-20x turnover through the sump. It just increases the failure rate. 1-4x through the sump is all anyone needs. The rest of the flow is accomplished with other methods. I love propeller type pumps for this purpose. Lots of flow, relatively small physical size, and low velocity flow.