Overflow dimensions

[Doug]

If i were to have one overflow, what would be the best dimensions for the overflow if i were to run the return as well as a durso standpipe ?
3" by 9" ? 4" x 8" (the overflow calculator on reefcentral says that i need 9inch linear overflow length for 600gph..but i dont know if that value includes the teeth or just the gaps)

I'm most likely running a 1 inch bulkheads (so 600gph) as my drain, and for my return i'd need a 3/4" bulkhead ..so taht means my largest drilled hole should be 1 3/4" inch ?

I like the two overflows for the reasons mentioned. My larger tanks had two. They were 6in. sq. inside measure. I dont like the smaller holes though. Both mine had 1.25in. drains, meaning the drilled holes were about 1.75 in. or so, depending on bulkheads.

However, on my 180 cube, I went with a single sq. corner overflow, again about 7in. sq. All these used eggcrate teeth by the way. This time I had a 2in. + hole drilled that allowed for a 1.5in. drain. I really liked that set up and the larger drain allowed for a pump size increase or not.

Just my opinion but I dont like 1in. drains. If doing so, then for sure two overflows is the way to go.
Help please, and thanks in advance. -- I asked 3 times on reefcentral, and my threads get buried in no time! Might as well try here as well!

[WuHT]

Wow thanks for the quick and helpful advise.


The only reason im' not having dual corner overflows is that my stand does not exactly allow me to run piping across (the wood partitioning are load bearing , and i'm not sure if i want to bore holes through them

However i'm curious about how removing the teeth actually increases surface skimming (would make sense for the same linear length) -- >so what do you guys use to prevent snails and other things from going over the surface that you don't want to : ie can anyone link me to gutterguard'd or eggcrate'd teethless overflows ?

Unfortunately, I'm probably restricted to one overflow , so for 150 gallon aquariums it's advisable for a 1.25" bulkhead/drain pipe and go for a 1 inch return/bulkhead ... or go for the slightly smaller combo of 1" bulkhead/drain and 3/4" return/bulkhead

[Doug]

Originally Posted by WuHT

Wow thanks for the quick and helpful advise.


The only reason im' not having dual corner overflows is that my stand does not exactly allow me to run piping across (the wood partitioning are load bearing , and i'm not sure if i want to bore holes through them

However i'm curious about how removing the teeth actually increases surface skimming (would make sense for the same linear length) -- >so what do you guys use to prevent snails and other things from going over the surface that you don't want to : ie can anyone link me to gutterguard'd or eggcrate'd teethless overflows ?

Unfortunately, I'm probably restricted to one overflow , so for 150 gallon aquariums it's advisable for a 1.25" bulkhead/drain pipe and go for a 1 inch return/bulkhead ... or go for the slightly smaller combo of 1" bulkhead/drain and 3/4" return/bulkhead

Hope my last post was not to hard to read. The quote never worked proper for some reason. A single is fine then. You could use the sq. one as I mentioned or the angled corner type someone else mentioned. I have pics of both types if you wish to see them. My preference still would be whatever size hole it takes for a 1.5in drain but if not possible then a 1.25in. drain.

[mark]

WuHT not to turn your post into a how much flow to my sump thread but you mentioned 600gph. If that's what you want, then your on the edge of seems accepted a 1" inch bulkhead will gravity flow.

Before can say more, what type of tank you planning, what type of turn over and how much you planning on relying on your return pump for display turn over? One leaning is flow no more to the sump that the gph rating of the skimmer, I at one time had 2000gph going through my sump (since reduced to 1000gph).

Me, I'm on the side of go big. Just because you have a big hole doesn't mean you have to max it, but does allow for flexibility as plans change. Applies to return bulkheads as well as drains, Realize overkill but I have 2-2" drains on a 145g.