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Alkalinity
Adjusting the alkalinity to between 80 and 120 ppm makes balancing the pH much easier and prevents problems with the plaster, thus extending the life of your plaster. If the alkalinity is below 80 ppm add a small amount of pH buffer (sodium bicarbonate) daily until it reads above 80 ppm. If the alkalinity is above 120 ppm add one quart (4 ounces for spas) of hydrochloric or muriatic acid per day, with the equipment running, until the reading is below 120 ppm. Low alkalinity causes copper sulfate staining, premature breakdown of the plaster and can corrode equipment parts. High alkalinity causes calcium scale to form on pool surface which causes a stained and rough surface. Once the alkalinity has been brought into balance you should check and adjust it, if necessary, once a month.
pH