| 
 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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