A similar thing happened a few months ago here. My local store carried
"IGA" brand DW that was reading 0.9 - 1.4 uS/cm. This was around the
time I started to increase the anode : cathode size ratio and was trying
out my new PWT! The local store switched distributors for their DW to
"SureFine" and this brand of DW runs at 3 - 4.5 uS/cm. and when I made
my usual gallon batch of SC it ended up pale yellow (the dogs didnt
notice the difference). I switched to Wal-Mart DW an have a stock of 12
gallons of Wal-Mart DW that is reading at 0.9 - 1.4 uS/cm. I will have
to find some pure DW when this runs out! I really liked the IGA brand.
This initial finding was made with a TDS but I didnt quite trust it
knowing the accuracy limits of the meter. My newly arived PWT confirmed
the difference.
I just bought me a pack of white shoe laces that will be used on the
cathode in my next brew. I am using the PS-30 Generator from PrideLabs
but it doesnt control the current as fine as I want it so I am working
on a cuircit to control the current. It will probly be a LM-334 to keep
it at 25 uA/sqin of anode area.
I like my PWT!
Frank
/*PS-30 Generator from PrideLabs
Brew Cell: Gallon Sun Tea Jar
cathode: 5" #14 .9999 silver wire
one inch separation
2 anodes: 7" #12 .9999 silver wire
air pump bubbler
brew temp: 120 f.
usual brew time 4-5 1/2 hrs
crystal clear CS @ 12-14 ppm
*/
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