Overflow system

[Thomashtom]

Hi would appreciate some help understanding this overflow system it has 4 bulkheads on back of tank, one on bottom of overflow which has a pvc pipe attached. How do I pump water back into tank? Do I need all 4 drains? Any input would be appreciated! Thanks

 

[blaxsun]

Where are the return outlets on the tank? Is this your tank or one you're considering purchasing?

 

[Thomashtom]

That’s my question? Can’t figure out where return lines are ? This is a tank I just received. Thank you

 

[Thomashtom]

That’s it?

 

[nereefpat]

Looks to be a home made job where they just ran returns over the top.

one on bottom of overflow which has a pvc pipe attached.

I don't know what this means. There is one pipe coming out of the 'floor' of the overflow?

I would scrap the whole design, if possible, being so hideous. The problem will be the holes. Maybe you can use the existing holes in the back for returns and do overflows in the corners or on the side.