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Re:Test Kits - interpreting results
I also use the Salifert test kit, but only the NO3, and the process is
similar to which
you described. Reading against the "white" background is difficult. I am
to get reasonably close. I also use the Dupla NO3 test kits, but they are
expensive...., so I use Dupla to regularly monitor the validity of Salifert.
For PO4, I prefer the Seachem test kit. Easy to read and reliable.