For a 20,000 gal pool with an average depth of 5 feet, a pumping rate of 42 gal/min, a 24 hour pump duty cycle, the pH will reach 7.50 after only about 2.4 days. 198 The Chemistry and Treatment of Swimming Pool and Spa Water
• Add acids to water, NEVER water to acid. Remember AAA (Always Add Acid). • Dissolve powders or crystals in water before adding to the pool. • Add chemicals dissolved in water to the pool when the pool is not in use. • Add large amounts gradually in thirds over a 2-hour period.
TIP – If you know your pools volume in gallons multiply the amount of gallons by 4.5 to give you an estimate of the volume in litres. I.e. 1,000-gallons is approximately 4,500-litres. 1,000-litres is the metric equivalent of 220-gallons. If you are unsure consult the manual supplied with the swimming pool.
Thus, one quart (i.e., 32 fl oz) of 31.45% muriatic acid and 38.5% sulfuric acid added to 10,000 gal of pool water reduces alkalinity by 12.5 and 12.7 ppm, respectively, as calculated by the following con- densed formulas: DTA = 3912.0 "V MA /V DTA = 3962.8 "V
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