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Ok, I am no fluid dynamics engineer, so I am totally confused about what to do for returns from the 1" PVC coming out of my overflow.

I have a 1-1/2" drain line with just a couple 90s....manufacturer says its rated for 1600 gph max. I have 1" return PVC with a Pan World Pump rated for 2000 gph. I have about 4 90s and 2 45s, a couple true union valves, and about 6' of static height. I also have a T off the return, feeding a small amount of water to the refugium...valve ...

Do any of you use mechanical filters like inline Ocean Clear systems with 25-100 microm cartridge filters, running them for a few hours once a week, to do any type of cleaning? I am still setting up my first sump system, and I want to try and get everything plumbed in that I might use in the future. I will already be running carbon in a reactor.

Also, should I be running any type of filter sock somewhere in my sump? or screens to cover the return inlet?

I also assume ...

I just bought some dry base rock from Reef Cleaners. Awsome looking stuff. I plan to add about 40# of live rock to the 200# of dry base rock...and take the time to seed/grow my own.

I asked them for suggestions on where to get substrate. They said to get Southdown from Home Depot, or visit local landscape companies to buy a yard of sand. I am sure people do this, but what are everyones' thoughts? I would obviously seed my sand with live sand from my existing tank.

Melev, ...