Was your 3-part container made by Advanced Acrylic by chance?
http://www.ebay.com/usr/luckreefWhere was the ato made? Looks like a pretty cool design!
I also used an OM and it did okay, but IMO it didn't move the water around like I wanted.
I used a Mag 9.5 with an OM Squirt initially, but it was never enough flow for me and in the end I didn't want that much flow moving through my small sump anyway so I eventually removed it.....