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A too high alkalinity can give false readings with atleast some brands.
FWIW the Salifert PO4 kit gives a max value for the alk which is IIRC something like 18 dkH ( 6.4 meq/L).
I recall that at least in the past approx the same was true for the Seachem test (Leo Morin on Fishnet).
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"I'm a big dumb stupid head." - Beerbutt
Proud owner of the very rare YET (Yellow Elephantis Tang) from the Lord Bibah Islands.
"LOL, well I have no brain apparently. " - dc (Debi)
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