Use and Care Manual

Spa Terms Glossary

ppm - Parts per million. A measurement of the dissolved substance

in the spa water such as bromine or chlorine.

pH - The measurement of relative acidity and basicity. The

recommended range is 7.4 - 7.8. In this range both spa user and

equipment are protected. If the pH levels are not in the acceptable

range use pH Up to make the water more basic or pH Down to make

the water more acidic.

Alkalinity - Refers to the concentration of alkaline materials in the

water. These materials have the ability to buffer or control the pH level.

A range of 100-150 ppm should be kept at all times. Alkalinity is raised

with Alkalinity Plus and reduced with pH Down.

Calcium Hardness - The measure of calcium salts contained in the

water. The standard range of 175-225 ppm is recommended. Above this

range the water can be cloudy and/or cause scaling on the tub surface,

equipment and piping. To increase hardness, add Hardness Plus. To

reduce hardness, partially drain and refill with water.

TDS - (Total Dissolved Solids) refers to the dissolved solids

found in water. Tap water, for instance, contains 50-330 ppm. If the

level of TDS increases to 1500 ppm the effectiveness of spa sanitizing

chemicals is greatly reduced and corrosion is accelerated. Spa Breeze

recommends changing the water in your spa every three months.