PPM is PARTS PER MILLION
in order to measure PPM, you need a PPM meter.
There should be other directions on the container to tell you how to mix it.
serpentine5 Reviewed by serpentine5 on . Sensi bloom much help needed Hey all having a bit of bother at the moment, I bought sensi bloom part a and part b but i don't know how much i'm ment to add to a litre of water, can somebody help please!!!!!!!!!!!!! Rating: 5