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Re: FRY FLOW-THROUGH RATES
"Stoecker,Michael,FRANKLIN PARK,NC&C" wrote:
> Anyone have a suggestion on flow rate [GPH] or turnover rate for the fry
> flow-through systems that have been talked about here recently and which was
> the subject of a talk at the last Convention?
> I am considering building such a system and ran across plastic,
> micro-control valves that state 2 GPH max. This doesn't sound like enough
> flow, but no pressure was stated for this 2 GPH rate either. Come to think
> of it, I could use some suggestions on very small water control valves for
> this type of setup. I am thinking of using 5-8G pan-type containers.
> Thanks for any suggestions.
It is easy for valves with really low flow to clog up. You might consider a
siphon-like tube into the tank with a length of yarn drawn through it.
Capillary action makes it self-starting if the source is temporarily lost, and
it has less tendency to be blocked by one small particle.
I didn't invent this system. Everyone who has accidentally left a strand of
mop hanging out of a tank has already discovered it. :-)
Turnover rate should be considered in terms of how many total tank volumes/day
and set to about one or two, in my guess. It's a matter of water conservation
vs effectiveness. Use multiple yarn siphons if one is too slow.
Cheap "U" siphons? Use the cloudy polyethylene tubing provided in refrigerator
ice-maker kits. Push a coat hanger or stiffer wire through a length of it and
bend to desired shape. Stick the bend in boiling water for a few seconds, and
allow to cool. When the wire is pulled out, the bend is more-or-less
PS. Baling Wire: Larval stage of Walkman earphones? [The world's supply of
this vital-to-civilization commodity seems to have vanished. ;-)]
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