Second Sump/Waterchange Tank Where to Drain?

[vegaskid11]

I am installing the second sump / waterchange tank to my new system and I was hoping to get a few opinions.

I split the right overflow to drain into a second sump/waterchange tank (150 gallons) and I will have the waterchange tank gravity draining back into the main sump. The waterchange sump has a 2" central overflow. I was originally just going to elbow the drain over and use a couple of 45 deg to get a slight slope and pop it through the side of the main sump. This would be just above the waterline on the right side (see pictures) I would of course use a bulkhead and use a full length pvc with holes for dispursing the water.

I then thought maybe I should carry the return down a bit and pop it in on the finish chamber (far left) If I drain in the right then it goes through my filter socks again. The second sump will house a large skimmer and will have my calc and kalk and all other liquid additives enteriung the system here. Then once a month for a waterchange I close the valve and isolate the main equipment, and a 150 gallons of water.

Do you guys think I should return it before the filter socks or after them?

Thanks

http://reefcentral.com/gallery/data/500/115678sump1-med.jpg

http://reefcentral.com/gallery/data/500/115678sump2-med.jpg

http://reefcentral.com/gallery/data/500/115678sump3-med.jpg

[neib]

I would think it would make no diffrence. If it's waterchange water it should be free of debris and such things so going through the filter socks should not cause a problem. However even if it does have debris in it it will eventually go through the filter socks anyways as it gets circulated in the system which need to be cleaned every once in a while anyways. So it would really seem that it would make no diffrence.