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Maybe the sample of water had a lot of dissolved organics and live bacteria in it. So your immediate tests were more representative of the actual state of the living water, but by the time the sample got to AWT, it had changed. Suspended bacteria had expired, organics had reacted and changed.
Can you do another, but this time pull two samples at the same time? Send the one to AWT, and tell them to call you when they start testing it. When they call, then start testing the second sample you kept home with you.
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