If the pH of the runoff water coming out is too high or too low for your range, you know that you'll need to correct the pH. Hydroponics. Test the pH of the reservoir by taking a small sample of water and use it to test the pH. If the pH is outside the 5.5-6.5 pH range, you know you'll need to correct the pH.
Overview. Bumps, itching, redness and other skin conditions are very common, and their cause may not be easily identifiable. Rashes can be caused by many things, including plants (poison ivy, for example), allergic reactions to a medication or a food, or an illness (measles or chickenpox, for example).Eczema and hives, both of which are related to allergies, are two of the most common skin rashes.Atopic dermatitis.ashes can be caused by many things, including plants (poison ivy, for example), allergic reactions to a medication or a food, or an illness (measles or chickenpox, for example).
Itching can be triggered by wool fibers or irritants, such as solvents or cosmetics. Itching can result from disorders that affect the skin, the nervous system (which senses itching), or other parts of the body (such as bile ducts or kidneys) or from drugs. Causes that affect more of the body than just the skin are called systemic causes.