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[compost_tea] DO2



Hi all-this subject has been touched on before.  

Having borrowed a DO2 meter, it's fun to finally see what's going on 
in the brew, and the spray tank.

24 hr. bubbled tap water in ETB-22 brewer DO2 9.3 (24 C)

Finished AACT DO2 7.6 (26 C)

Added 1% fish/0.5% kelp to AACT in spray tank, sprayed half an hour 
then checked balance of AACT/food mixture in tank DO2 1.3 

Also checked the inch or two deep CT left in the brewer for half an 
hour (that the pump didn't get out into the sprayer, so it was not 
being aerated, just sitting in the "open" brewer, DO2 5.5

One handy thing with this Extech (maybe all meters?) is the temp is 
displayed along with the DO2.  Sure notice how the oxygen level drops 
as temp rises.  Even without microbial action, the oxygen levels are 
surprisingly lessened as the air/water temps rise during the day,
more 
so as this warmer tea supports greater microbe metabolism=oxygen 
demand.  Kind of a double whammy. 

The concerns earlier this spring about having to heat our brewers 
don't seem as problematic to me now, compared to the question of how 
to keep everything cool during the summer!  I already had one brew 
reach 86F on a warm evening, this is only May in cool SW British 
Columbia.  Air conditioning needed?

I guess you folks in Vegas have grappled with this...

Glen




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