I've previously used API Test kit and just recently bought the SALIFERT nitrate kit. I've read the instruction that it should be read from the TOP, How is that is it literally looking directly downward?
Tested my water:
API reads 40ppm
SALIFERT reads 10ppm (from the top) & 100ppm (when looking from the side)
Help please.
Tested my water:
API reads 40ppm
SALIFERT reads 10ppm (from the top) & 100ppm (when looking from the side)
Help please.