I'm trying to figure out what could cause Ca reading to go off the scale. Tested with one testkit and got over 600. Bought and tested it with Salifert Ca and got on regular test 520 but using the diluted test 660.
KH is 11.8 dkh or 4.23 meq/l
pH between 8.20 and 8.50
Temp 81
NO3 = 25 ppm
PO4...
