overflow drain

I went on to Glass-holes.com and was going to order their 700 gph overflow kit but have a few questions before I order it.

The kit comes with 1 1/2" bulkhead. should or can I reduce this down to 1" to drain into sump/fuge?

Most importantly, Will this work for my new build?

46 BF 20g DIY sump/fuge
iwaki MD20RLXT 540 gph @4' head (DT will be about 3' from sump)
3/4" return

Thanks in advance

 

I have the same overflow on my 90 gallon and it works great. I have a mag 9.5 as a return and have had no problems. I also have it reduced to 1" pipe as it enters into the sump and seems to work fine.

 

Thanks kracer!! This will be a first for me. My 1st tank is a nano all in 1 and it's time to upgrade since I'm moving. Will my turnover and flow be ok with that pump?

 

if you reduce it to 1" im pretty sure you wont be getting the advertised 700GPH. if your return will do 540 at 4'(maybe 600 at 3') it may need to be throttled down a notch. just keep that in mind and you should be gold.

 

I would rather not put the stress on the pump as it is an inline pump and can't T off so that water is diverted back to the sump without a lot of extra plumbing. If I leave the drain 1 1/2" can I maybe avoid throttling back the pump? Get a smaller pump?

 

I have my mag 9.5 at about 5 feed of head pressure so it should be pushing about 720 to 750 gph and it is running wide open without having to throttle back the pump at all. The 700 gph overflow is keeping up fine with the 1 1/2 to 1" reduction. I think the 700 gph rating they give at glass holes is a bit on the safer side of what this overflow can really flow.

 

Thanks guys. I think I'll stick with my original plan and reduce it down to 1". My drain will split so I have a drain line to the sump part as well as my fuge. I'll add a ball valve on both so that I can control the flow. It will be much slower through the fuge.

Thanks again all! Happy Reefing

 

1" sch 40 PVC can flow just under 1000 gph.

AGA rates theirs at 600 gph, glass holes says 700 gph, but as long as you don't have a ton of 90" elbows, or other restrictions, it will flow a lot more than that.

 

1" is plenty and having a 45ga. I think 700 is also plenty. I say go for it and obviously the ball valve on each exit of water just in case you want to limit etc. Good luck!!!

 

Great info Thanks K+