Okay well the Big Bloom wont really have a significant effect on the increase of phosphorus. But when i said ph i meant pH or potential Hydrogen. Not phosphorus. But i saw you mention something about a pH meter and also about under watering. Good news on the tester as it will help immensely and as far as under watering, water til you have about 20% run off i believe. And then only water when the soil is dry up to your first knuckle or so. And again with the big bloom. Its kinda like a micro nutrient mix and is good for roots and over all plant vigor. Hope this helps. Also, all the info you need is most likely already on GWE. Just search for it and more than likely, it'll pop up, with detailed information. Good luck and happy growing.