It looks like the BK's have a larger rectangular chamber underneath which allows them to have bubbles stay in the water longer, then it looks like theres some sort of bubble realease thing in the main chamber?

Well, the head pressure might bring it down to 700gph anyways, so that would still work.

I decided what I would like to do is go with a Blueline 800, with 700 or so gph through the sump, then a mag 5 on a closed loop.

Thanks,

Chris

The BK's are fat because of the pump. RD pumps don't handle pressure very well from what I've read and a taller reaction chamber would just cut down on the efficiency of the unit. Being fatter compensates.

I think there is a little more to it than that. Here is a link to the BK home page from Germany where they are built if you want more information.
http://english.royal-exclusiv.de/index2.htm

Hummm, I'm not really pulling more out of that site than what I had initially stated. It's mostly splitting hairs on the forums.

Anyway, there's a thread on RC about a DIY needlewheel Dart that Spazz is working on and there's some pretty detailed info on the workings of BK in there.

are the poseidon pumps the same as the Blueline velocity pumps?

Looks like they are!

http://www.jlaquatics.com/phpstore/store_pages/details/pumps.php?product_ID=wp-ps2

I was thinking about going with a velocity... guess I'll stick to the NS and HD series blue-lines.

(Have made changes to original specs/design etc...) thread no longer applicable. Thanks.

Chris

Chris are you coming out next saturday? You can check out the Blueline then. :wink: