Doesn't suck enough

[Theguyfromnj]

I feel like an idiot asking this, maybe it is just a brain fart.

I have a back drilled 20L being fed about 250gph via 3/4" vinyl tubing. The drain is 1" vinyl tubing going down a pretty good slope with no elbows just a slight unkinked bend.

Why can't the 1" drain keep up with a 250gph pump?

 

[Theguyfromnj]

I'm right in the middle of setting this up, so any help would be great.

 

[chuggy]

the drain lines probably not big enough dont forget your pumpin water through the 3/4 buyt only gravity is bringing it down through the 1

put a ball valve on the pump line and dial down the pump a bit

 

[Theguyfromnj]

im only pushing 250 now, i limit it any more I won't have any water moving through the filter.

 

[Reefbox]

1" drain will easily keep up w 250 gph. Check the drain for something plugging it.

 

[jvdb]

Is it gurgling at all? Can you post pics of your overflow?

 

[Theguyfromnj]

It was all new plumbing, so nothing was cloging it. I went ahead and hard plumbed the return with 1" PVC and it flows like a dream, only now I am getting the sucking sound.

 

[Tswifty]

What return pump are you using?

 

[Theguyfromnj]

I don't know the brand, but it is a 300gph pump. Figuring in head, I guess I am pushing 250-275gph.

 

[crvz]

I imagine your head loss is more than that, how far is the travel for the return plumbing? The vinyl tubing can get pinched down somewhat, which may have been the problem, but good to hear the PVC fixed it up.

 

[Theguyfromnj]

The return goes over about 8" then up about 3'. The PVC did fix it. Now I just have to figure out how to stop it from making all that sucking sound. It's not flushing.

 

[Tswifty]

I'm thinking a simple standpipe would fix the problem, the addition of a downward turned 90 degree elbow may also help the cause.

 

[djm2221]

agree with the elbow

 

[pete 43]

90 degree

90 degree

My vote goes to the 90 degree on the output.The ball valve is also a good idea,or even both if you need them
Good luck

 

[Theguyfromnj]

I tried the 90, it just drops the water to the level of the bottom of the 90, which is 2" lower than I want it.

What kind of stand pipe you have in mind?

 

[krowleey]

<a href=showthread.php?s=&postid=13226325#post13226325 target=_blank>Originally posted</a> by chuggy
the drain lines probably not big enough dont forget your pumpin water through the 3/4 buyt only gravity is bringing it down through the 1

put a ball valve on the pump line and dial down the pump a bit

maybe the problem is you have the back drilled on the tank instead of the bottom, and its slowing down the drain, unlike gravity fed bottom drilled?

 

[chuggy]

check out this page

http://home.everestkc.net/jrobertson57268/HGB/HGB_construction.html

 

[Tswifty]

<a href=showthread.php?s=&postid=13228680#post13228680 target=_blank>Originally posted</a> by Theguyfromnj
I tried the 90, it just drops the water to the level of the bottom of the 90, which is 2" lower than I want it.

What kind of stand pipe you have in mind?

Basically something like one of these that will have a way of allowing the trapped air to escape from your drain lines. You certainly don't need to add the ball valves though.