UGJ layout

[sashimimaster]

I'm setting up an undergravel jet system and just wanted to get some input.

The footprint is 72 X 18 so with 1" CPVC tubing I should be able to cover it with 3 rows. I want to try and use one powerhead so this is the layout I came up with.

Anyone have any suggestions, comments?

 

[gomezladdams]

I believe a single loop will work better for equalizing pressure to the jets.

 

[the_deeb]

Agreed. With your current design you'll have very little flow left at the ends of your pipes. A loop would be best but if you really want 3 rows then this would be a better design.

 

[sashimimaster]

You mean something like this?

 

[the_deeb]

Yes. Though I think that for an 18" wide tank two rows will be fine, so just a circle (no need for the extra row in the middle).

 

[sashimimaster]

Yes. Though I think that for an 18" wide tank two rows will be fine, so just a circle (no need for the extra row in the middle).

Hmm, now that I think about it it does make more sense. With less tubing and less holes the pressure will be greater so the flow will be a little better. Thanks for the input!

 

[the_deeb]

Exactly. Based on the same principle it might be a good idea to use sweeps instead of regular elbows in the corners (less resistance), though I don't really know how much of a difference it would make.

 

[sashimimaster]

Ok, I think I've got it. What size powerhead should I use?

 

[sashimimaster]

Anyone have a suggestion on what size powerhead I would need?

 

[dawnmarie]

Late to the party, just spotted your thread.
I have a similar setup in a 60 x 18 and found that a simple loop was not enough.

You definitely want to keep all the ends tied into a loop to equalize pressure. I am currently using a 500 GPH Little Giant 2-MD.
You will certainly want to have thorough and effective pre filtration to prevent solids from entering the gravel bed.
I used 5/32" holes, 2" OC in two rows per pipe, angled out and down @ 45 dgrees.

So far I have Gravel vac'ed and W/C once a month.
The vac picks up the few larger pieces not collected by the skimmer.
I am considering a slightly larger pump to see if this improves the skimming but once a month vac's are a huge improvement over my original setup.
Monthly versus weekly w/c is maintaining Nitrates @ 20 PPM or less.(no drip system yet)
I do service the Mechanical filtration every week. (more photo's in album).
Hope this helps.