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I had similar results, esp CA. My CA tested 440 with salifert prior to sending my sample to AWT. The AWT test came back with a CA of 326?
Tested my water again:
Salifert- 440-450
API - 450
LFS - 440 (dont know the brand of test)
ELOS - 460 (friends kit)
I dont know what is wrong with AWT. Several posts have confirmed that that their CA and PO4 tests are bogus.
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