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Hard to say since there have been hardly any good PO4 tests at that time. I also have no records from my time in the museum.What was your PO4 in mg/L at that time? Below 0.03 mg/L?
Sincerely Lasse
The PO4 supply was continuous. I guess the PO4 concentrations were nevertheless low or very low. Nitrate interferes with phosphate and has its most negative effects at very low phosphate concentrations.