any reason not to push the max flow through a durso standpipe?

[wonk]

I'm in the process of setting up my 120G w/ basement sump. With freshwater testing, I'm getting somewhere around 1000gph through the durso standpipe. If I add any more flow, I get the 'flushing effect'. I've found that my drainpipe is very, very positional--if it's not in the right position, I get flushing. It's currently made of spaflex, which I think is causing part of the problem, because there is a nearly horizontal section and then a nearly vertical one entering the sump.

It seems that if I improve the attitude of the drainpipe, that I could get more flow into the sump, and therefore push more water up to the display. I have one of the new WavySeas units that I'd like to get as much throughput from as possible.

Is there any reason NOT to push as much gph as possible through the overflow? If I can get 12-1400 gph running quitely through the system, are there issues that I'm causing?

I guess I'm wondering about how the 600-1000 gph through sump rule is based. . . outside of noize, what other factors limit your sump gph throughput?

thanks, Kevin

 

[dougchambers]

To reduce the flushing tendencies, play with the hole size for the make-up air. If you fully remove the cap, do you still get flushing?

On a separate note, I generally take a different approach. Instead of pushing more through your durso and getting increasing sump flow, increasing microbubbles, and possibly reducing the effectiveness of skimmers and refugiums... explore options of building a closed loop and actually reducing your durso flow.

When configured correctly, closed loops are very effective at moving large amounts of water without the nasty side effects of massive flow through a sump.

-Doug

 

[wonk]

i already have a dart closed loop in the system. I also will have a seio 2600 in there to get 50-60x the flow in the tank.

I have a hole in the cap... doesn't seem to make any diffrence compared to no having a cap at all.

so microbubbles is a possible effect of more flow...possibly decreasing effect of skimmer (though that could be mitated by diverting some flow to a separate part of the sump containing the skimmer). Other reasons not run more flow?

I don't appear to be getting microbubbles... maybe I will if I push more water...

 

[HippieSmell]

I'm assuming you have the AGA 120 with 2 megaflows, correct? So, are you getting 1000 gph through one durso or 2?

 

[wonk]

No, I have a custom tank with a large overflow and a 1.5" durso