Salifert Freshwater Phosphate PO4 Test Kit - For Freshwater Tanks

1] Add with the syringe 10 ml (2 x 5 ml) of water in the test vial.
2] Add to the test vial 4 drops of the PO4-1 reagent and swirl for 10 seconds.
3] Add to the test vial 1 level scoop of PO4-2 and swirl gently for 30 seconds.
Place the test vial on the yellow part of the colour chart and compare colours.