Just started dosing P in the form of fleet enema. My math and what others say leads me to believe that I know that amounts I am dosing. ! drop from the "appilcator" is approx. .1 mg/l in 10 gallons. I dose 5 drops, check it an hour later and I am only up .1ppm. I shake it well before dosing. I am wondering if my plants were really starved for P could they take it up that fast?