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Re: [compost_tea] Pumps and Aerob-a-jet



Title: Message
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
-----Original Message-----
From: Jason Austin [mailto:jason.austin@shaw.ca]
Sent: Monday, May 12, 2003 12:16 PM
To: compost_tea@yahoogroups.com
Subject: Re: [compost_tea] Pumps and Aerob-a-jet

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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