Loc-line Plumbing Question
 

Hi All,

Just re-did my return plumbing over the back of my tank to permit me to have a herbie overflow.

I have 3 feet of head pressure on a brand new Waveline DC-4000 pump that's plumbed with 1" all the way from the pump up and over the back of the tank. It then Tee's off to either side of the tank. In each back corner the 1" is reduced to 3/4" by way of a 90 degree PVC reducer.

A 3/4" Loc-line fitting is threaded in, and a Loc-line Y is on there an then it goes out to 3/4" round Loc-line nozzles

I'm getting rather poor flow.

Should I switch them out to 4x 3" wide flare nozzles (stick with 3/4" diameter)?

Or should I go down to 4x smaller Loc-line Nozzles?

Thanks for any insight

Cheers.

these might help, I've looked at them but never tried them.
http://www.aquariumsupplies.ca/eductor-p-860.html

going down in size will up your velocity and better flow, much like squeezing down the nozzle on your garden hose.

I see in your sig you're using a pair of MP40s, so you have the ability for lots of in-tank flow
And just a rough guess, I'd say your system volume is around 110G ? Maybe 120G ?
The ideal flow rate through your sump is 6.1x total system volume
So unless you're getting much less than 700-ish GPH, I wouldn't be overly concerned about it and just stick with what you like about your plumbing

3/4" duck bill gives the feeling of more "pressure" versus the round one