Typically, a PhD will take approximately eight years beyond high school graduation to complete.
About 8 years. for a Ph. D.
Many plants are tolerant of wide ranges of pH but many are very specific in their pH requirements. A good example is the blueberry which will only grow in a pH below 5.
you can use ph when you need it
You need a pH-paper or a pH-meter.
This would be strictly dependent on which type of therapist you are referring to for there are many types. There are psychotherapist, physical therapist, occupational therapist, speech therapist etc.
PH measures the acidity / base levels of the water. To lower the PH, you will need sometime of base. They sell PH Minus (to lower) the PH in many stores. If you do not have access to that you can actually use something like baking soda, but it may affect the clarity of the water.
You need a pH paper but better is it to have an electronic pH meter.
You need to determine the percent of hydrogen (pH) molecules in the solution.
AES College loans are available for some Ph. D students in the Untied States. To find out if you qualify, visit the SACS website.
It depends on the volume of your pool and what level your Ph is at.
The optimal pH depends on what you are growing. Much like soil pH, it will need to be adjusted per crop.
pH ranges from 1 (acid) to 14 (base). As far as acceptble range, you need to make clearer what else you need to know...like pH range of blood.