wtb

[demon666]

im looking for a mag 12 or 18 or an equivalent pump to use as a return pump.

[TheReefGeek]

That's a lot of water flow, how many drain lines and what size are you running?

[demon666]

2 returns 1/2 pvc 1 drain to the sump

[TheReefGeek]

Are you just setting up this system, or are you replacing a pump?

Don't try to push too much through your overflow to solve your water flow in your tank, you are asking for trouble.

How big is your single drain line bulkhead? I always recommend 2 drain lines, and to only push the gph rating of 1 of them, then you have a backup in case of failure.

How big is your display tank and sump? You might fight with microbubbles if your turnover is too high in your sump.

I know this is just a wtb ad, but you might not need/want that big of a pump. You might be better served with a mag 7 or similar, and plumb a closed loop for added (and safer) water flow. You could one 1/2" return for the sump return, then use the other for the input of a closed loop, then retun via a manifold with loc line for later easy adjustment of waterflow.

[demon666]

its a 1.5" bulkhead the tank is 120g and the sump is 36 which maybe upgraded to a 66g when my fw tank dies off. then tank isnt up yet just water testing right now. then return pump is pushing 6 or 700gph right now and im just not happy with it. i have thought about doing a closed loop but not right now.

[TheReefGeek]

What kind of overflow are you running?

What aren't you happy with, the total flow in your tank? I wouldn't push more than 6-700 gph through a single 1.5" bulkhead, although if you use a durso you should be able to push it and use a mag 12.

If you have 2 x 1/2" returns, I would go max 450gph out of each, so 900gph total. So with head pressure, the mag 12 should do that job. If you get a mag 18, you will probably have to throttle it back so it doesn't overdue your overflow. You can t-off your return line back into your sump with a valve, or just use a valve.

[demon666]

it is a durso drain

[TheReefGeek]

Are you trying to get all your flow through your return system, no powerheads, closed loop, etc?

[demon666]

for right now yes.... when it is time to put the tank on line then no..... i will add a closed loop at a latter time but for now i just want more flow from my return

[mr_alberta]

Does it have to be a submersible pump or can it be external?

[demon666]

i guess it could be external i would just have to plumb it a little different