To lower the pH in a swimming pool using muriatic acid, the amount needed depends on the pool size, current pH level, and the strength of the acid. Here are key guidelines:
- For a 10,000-gallon pool, about 5 ounces of 31% strength muriatic acid will lower the pH by approximately 0.1
. Alternatively, some sources suggest about 10 ounces of 15% strength acid for the same pH reduction
- Another common rule of thumb is to add one quart (about 32 ounces) of muriatic acid per 10,000 gallons to lower the pH by 0.1
- For larger pools, such as 15,000 gallons with a pH above 7.8, start by adding 1 quart (ΒΌ gallon) of muriatic acid, then retest after one hour before adding more
- Generally, 20 ounces of muriatic acid will lower alkalinity by 10 ppm in 10,000 gallons, which also affects pH
- Always add acid slowly and in small amounts, retesting frequently to avoid overcorrection, which can cause skin and eye irritation and damage pool equipment
- Safety precautions include wearing protective gear (gloves, goggles, mask), adding acid to water (never water to acid), and diluting acid if desired before adding to the pool
In summary, start with about 5 to 10 ounces of 31% muriatic acid per 10,000 gallons to lower pH by 0.1, adjust based on your pool size and pH readings, and always add acid gradually with proper safety measures
