How much alum do you use in swimming pool water?

Alum, also known as aluminum sulfate, is a chemical often used as a coagulant in swimming pool water. The amount of alum required depends on the volume of the pool water and the desired chemical balance. For general purposes, the following guidelines can be followed:

- For pools up to 20,000 gallons: Add 1 pound of alum for every 2,000 gallons of water.

- For pools over 20,000 gallons: Add 1 gallon of alum per 10,000 gallons of water.

These amounts are approximate and may require adjustments based on water chemistry, pump circulation, and specific pool conditions. Always test the pool water regularly and adjust the alum dosage as needed to ensure optimal water clarity and quality. It's best to consult with a pool maintenance professional or refer to local regulations for specific alum dosage recommendations.