Should I use 1" or 1.5" for 260g?

[FishNCash]

I never try running quiet one pump on this sump. I have not drill my overflow yet. You got me sold on the Laguna pump performance so I figure to set up right the first time. That way I don't have worry about the hassles of upgrading.

I'll probably save the quiet one pump to do water changes.

 

[ElectricBlueSeanBurch]

Maybe I'm misunderstanding, but drain pipe size has no bearing on the electrical consumption of your pump.

A 1" drain can handle about 600GPH
A 1.5" drain can handle about 1,350GPH

If you want to run a larger pump that will push more GPH, it will use more electricity.



What pump are you running and how high is the water being pumped? I doubt you are actually getting 2,700 total GPH.

A 1" drain is capable of handling about 600GPH, so I'm thinking you are not really pushing 1350GPH through each 1" drain.

The whole 600gph rule of thumb is flat out wrong. I have a DSA 225 with a single overflow box. 3 drains (1") and 2 returns (1"). H have 2 laguna max flo 2000's hard-plumbed (1 on each return) and @ 5' of head and 2 90's in the return plumbing my drains can easily handle the flow. I measured the flow with a 75g tank and it's getting around 1400-1500gph(ish)actual flow from each pump. Crazy right? That's around 933gph per 1" drain. Stay with me here and put your helmets on. It can also handle both pumps wide open while I have my python hooked up and have my outside faucet on full blast topping off the tank. None of the 3 durso's are at full siphon during this, and my overflows are dead quiet. I think people drastically underestimate flow capacity to err on the side of caution. But truth be told it isn't true and the truth shall set you free. My old 220 had a single overflow box with a single 1" drain and I once hooked a mag 18 up just to see what would happen and under full siphon it handled the pump completely, however even I wouldn't recommend that...

 

[ElectricBlueSeanBurch]

OP the sump looks to be acrylic, in which case it would be really easy to drill for 1" drains. Just buy the proper size bit and then add the 2 bulkheads. That would solve all the issues. Personally I would hard-plumb everything. This has always worked well for me