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Re: [Killietalk] flow through systems?

I can't be certain it is true of all pumps, but I was assured by a distributor of Little Giant pumps that it does not hurt the pump to have it pumping against a resistance. In fact, they suggested that if the output of the pump was too high to put a clamp or similar on the output tubing to reduce flow. The main thing you will need to figure for a small setup like that is that the pump can handle the head pressure you need. The specs typically tell you the maximum head the pump can handle. I like the Little Giant pumps, particularly a couple of models that can have filters attached to the intake. This allows you to reduce uptake of particulates, which interfere with the function of UV irradiators. The supplier I have used is http://www.pumpworld.net/.

Barry

At 11:04 AM 10/5/2003 -0500, you wrote:
There are many flow thru setups. Mine is strictly for fry and uses shoe boxes. I think in all cases it is best to have your return plumbing (which I assume you mean the supply after the tank take-offs) return to the supply sump. I would suggest you put a ball valve in this line just before it enters the sump. Then you can close the valve just enough to create enough back pressure to allow your tank supplys some pressure yet not put too much back pressure on your water supply pump.
George

Chris wrote:

Good morning everyone,
I'm considering building a flow through fry rearing system and would
like to get some input from those of you who have experience with
flow-throughs.
My plan is to have three 2.5 gallon tanks on one shelf and two 5 gallon
tanks on the shelf below.  All five tanks will be drilled and fitted
with a PVC bulkhead and elbow, similar to the system that Barry Cooper
has pictured in his album on the AKA site.  The over flow will be
plumbed with .5" PVC and will dump into a 30 gallon sump which will
contain lava rock, a heater and a return pump.  The return will be
plumbed with .5 " PVC back up to the fry tanks, and will flow through a
UV sterilizer.

I'm particularly interested in how people have mounted their drip
emitters to prevent leaking, what size return pumps are being used, and
if the return plumbing is deadheaded at the end or returned to the sump.
I'd also like to hear how people would do their systems over, now that
they already have them up and running.
Lastly, aside from UV sterilization and quarantine, what do people do
about disease control, and what experiences do you guys have with
disease in these types of systems?
Cheers,
Chris
Rye NY
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Barry J. Cooper, Prof. Emeritus, Dept. Biomedical Sciences, Cornell University
Adjunct faculty, College of Veterinary Medicine, Oregon State University
Home address: 27505 Riggs Hill Rd., Sweet Home, OR 97386 (bjc3 at cornell_edu)


To join the AKA see http://www.aka.org/pages/join.html