Peter
I have been using a spa pump to power a 1100L brewer. Its
output is 3000L per minute. Been using it for 3 months now with continuous use
upto and beyond 24hrs and it is still going strong. Provide excellent aeration.
Cost me $300.00 (AUS). Made by those marvelous kiwis - company called Pool-Quip:
390c Church Street, Penrose PO Box 12 840 , Auckland NZ.
Tel: 64-9-525-4214
----- Original Message -----
Sent: Tuesday, May 13, 2003 4:04 AM
Subject: RE: [compost_tea] Pumps and
Aerob-a-jet
So
basically it sounds like nobody knows anything concrete about this issue. I'll
keep with my soaker hose and stanard air pumps. So back to a previous
questions. Anyone no a good supplier for pumps that put out 9+ CFM. One person
here recommended Gast, but they are over $1,000. Hoping to find something
cheaper. Are conventional compress capable of the kind of duty cycles (on for
10 hours straight) that compost tea requires?
Peter
Thomas Giannou
wrote:
Hi Peter,
I don't remember seeing anything from Elaine on this
topic. But who knows, she sometimes replies but doesn't copy text
from the message. Sometimes ?
<grin>
Here is Elaines's message from May 6th under the heading
of Simple CT maker
Compost tea brewers are a bit
different from fish tanks. Fish don't get growing quite as fast as
bacteria. When you feed bacteria well, they can use up all the
oxygen in any amount of water within minutes, and therefore the aeration
rate needs to be high enough to offset bacterial and fungal growth.
The fine bubbles are not the preferable condition. The fine
bubbles are really hard on the fungi and seem to break them up and shatter
them.
If you suspend fine bubbles in the water, by
over-aerating, you end up with problems. Too much air, and not
enough water (supersaturation?), and the organisms will be killed because
the environment become too oxidizing.
Cute, huh? Not
too much, not too little..... Goldilocks strikes again.
We need
some additional testing on the fine bubble versus coarse bubble
situation. The fine bubble work we've done suggests that fine
bubbles are quite detrimental. The bigger bubbles seem to do a
better job of extracting hte organisms from the tea, and keeping things as
aerated as possible.
Always something more to know.
So, what is the optimal aeration rate? Depends on how much food you
add, the compost you use, the temperature of the water.
Check the www.magicsoil.com web site. Some
interesting insights there about aeration.
Elaine
Ingham President, Soil Foodweb Inc. www.soilfoodweb.com Jason
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