Cotinine is detectable in blood for at least several days after exposure to tobacco smoke. Depending on how much you smoke, the level of cotinine in your blood will reflect a nonsmoker level in 7 to 10 days. The nicotine test that offers the longest detection window is a hair follicle nicotine test. These are rarely administered due to their expense, but they do exist.
High pH is NOT always BAD! But, high pH is NOT always GOOD, either! The recommendation that swimming pools should be operated at pH levels between 7.2 and 7.6 is almost universal. This recommendation is enshrined in generations of pool books and literature. It's embedded in many state swimming pool codes. Unfortunately, for most swimming pools, it's also far from ideal.
Low pH levels in a pool can be caused by rainwater and other foreign particles getting into pool and changing the chemical make-up of the water. Corrosion of metal accessories, burning of the nose and eyes, rapid chlorine reduction and itchy, dry skin and scalp can be signs of low pH levels in a pool. Low pH levels also reduce the sanitation of a pool. Regular testing and chemical treatment can help to maintain pH levels. Utilize these tips to raise pH in a pool.