Lost instructions for the Salifert phosphate test

[Ruth]

1) Add 10ml of water in the test vial
2) Add to this 4 drops of PO4-1 and swirl for 10 sec.
3) Add to this 1 level scoop of PO4-2 reagent and swirl for 30 sec.
4) Place the open test vial on top of the color chart on a part of the chart which is white and compare the colors looking from the top.

The phospahte values are in ppm phosphate.

0.03 - good
0.10 - critical
0.25 - coral growth retarded
0.50 - your hooped (it doesn't actually say that I just added it)

Should you require an even higher sensitivity then double the water sample and the reagents. The scale should then be divided by 2

Hope that helps