Commercial Clearwater Company, Inc.

Basic Swimming Pool Water Chemistry
These are commonly accepted parameters that do not supercede local or state codes and regulations.
Correct water chemistry starts with balancing the following factors    
Free Available Chlorine When any chlorine compound is added to the water hypochlorous acid - the active sanitizer - is formed. The strength and effectiveness of chlorine sanitizer is dependent on the Ph level of the water. Pools: 1.0 to 2.0 ppm
Spas: 2.0 to 3.0 ppm
Combined Chlorine When free active chlorine reacts with ammonia, organic nitrogen compounds and other contaminates in the pool water, it forms chloramines. Chloramines are not an effective disinfectant and causes eye irritation and chlorine odor. Pools: 0.0 ppm
Spas: 0.0 ppm

Bromine When bromine is added to water Hypobromous Acid is formed. Like chlorine, this is a sanitizer. Pools: 2.0 to 3.0 ppm
Spas: 2.0 to 3.0 ppm
PH When pH is not balanced bathers experience discomfort, chlorine loses its effectiveness, and pool surfaces and equipment is damaged. pH is raised by adding soda ash or caustic soda, and lowered by adding sodium bisulfate or muriatic acid. Pools: 7.2 to 7.4
Spas: 7.2 to 7.4 

Total Alkalinity  Without proper balance of total alkalinity wild fluctuations in pH may occur. Total alkalinity is raised by adding sodium bicarbonate and lowered by adding sodium bisulfate or muriatic acid.  Pools: 60 to 150 ppm
Spas: 60 to 150 ppm
Calcium Hardness  Without proper calcium hardness balance, calcium is leached from pool surfaces or deposited on equipment. Calcium hardness is raised by adding calcium chloride.  Pools: 200 to 400 ppm
Spas: 150 to 250 ppm
Total Dissolved Solids  The total amount of all material dissolved in the pool water. As water is reused and chemicals are added, a load develops that adversely affects water balance. High TDS pool water must be diluted with fresh make-up water.  Pools & Spas:
Should not exceed 1,500 ppm