Question

Cyanuric acid is sometimes used as a stabilizer in pool water and must never exceed:

A) 1000 parts per million
B) 10 parts per million
C) 250 parts per million
D) 50 parts per million

Answer 1

Cyanuric acid levels in pool water must not exceed 100 parts per million (ppm). For a 5,000 gallon pool, to reach a chlorine concentration of 3.0 ppm, one must add a total of 63.6 grams of chlorine.

Step-by-step explanation:

Cyanuric Acid Levels in Pool Water

The concentration of cyanuric acid used as a stabilizer in pool water must never exceed 100 parts per million (ppm). This safety threshold helps to ensure that the pool remains a safe and healthy environment for swimmers, preventing the buildup of harmful substances.

Chlorine Treatment for Pool Water

To achieve a chlorine concentration of 3.0 ppm in a typical 5,000 gallon pool, which contains 21,200 kg of water, you would add 3 ppm by mass. Calculating this in kilograms requires understanding that ppm is equivalent to milligrams per kilogram of solution. Therefore, you need to add 3 mg of chlorine for each kg of water, resulting in a total mass of 63.6 grams of chlorine required to achieve the desired concentration.