im about to build an under gravel jet system, what kind of pump can i use that is under $30 for my 85 gallon tank. is using one enough? Im on a budejet and dont want to up the electricity.. but if I have to ill get two.
How many jets to you plan to have and what is the total head preasure of your pipework? You'll want 100-150 gph per jet to be effective for most systems.
Here's a guide to help you figure out the head preasure. Where it asks for number of outlets just put 1 since you'll be pinching down the openings for the jets. You'll have to try a few different pumps from the selection to see what will be needed for your particular ugj design. http://www.reefcentral.com/calc/hlc2.php
Eggcrate is up to you. Do you need it? Not really, but it's nice if your stacking rock and it will help keep everything in place if you zip tie your ugj to it.
I'm useing a couple of Cap 2200 at 800gph for 12 jets. I tried to find a price for you but they seem to be hard to come by these days. I bought mine a couple of years ago for $34 each if I remember right.
A lot depends on how your tank decor is set up. Ideally you'll want the jets to direct the water toward your filter pick-ups. If you have a good idea how your rocks, driftwood or anything else that will sit on the bottom of the tank is going to be arranged you would want to set up your filter inlet and outlets and your ugj to maximize detritus evacuation. You'll always have some areas crud will accumulate but ugj's will help keep it to a minimum.
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