Microscopic plants capable that grow in or around water.
Products added to spa water that prevent or control algae growth.
Microscopic organisms, some of which can be harmful.
The proper ratio of mineral content and pH that prevents hot tub water from being corrosive or scale-forming.
A halogen chemical element often used in liquid, solid, or powder form as an alternative to chlorine as a sanitizer for hot tub water.
Calcium Hardness (CH)
The amount of dissolved calcium in water. Ideal range for hot tubs is generally 175 – 275ppm depending on surface type.
A halogen chemical element, compounds of which are the most widely used additives used in hot tub water sanitation.
Irritating compounds formed by the combination of nitrogenous compounds and free chlorine. Nitrogenous compounds are introduced into the water by perspiration, cosmetics, suntan oils, etc.
The amount of chlorine addition required before a free chlorine residual can be maintained.
The amount of chlorine left to kill new bacteria entering the hot tub. Also, the amount of chlorine left after chlorine demand has been satisfied.
Combined Chlorine (Chloramine)
Chlorine-ammonia compounds that can cause chlorine odor and eye irritation. This compound is a poor sanitizer for hot tub water applications.
Cyanuric Acid (CYA)
A compound added to pools that prevents the dissipation of chlorine residuals by sunlight.
Free (Available) Chlorine
Chlorine in a form capable of bacteria and algae destruction. Preferred range: 1.0 to 3.0 ppm.
A hot tub is a large tub or small pool full of ready heated water used for soaking, relaxation, hydrotherapy, or meditation. In most cases, these self-contained units have jets for massage purposes. Hot tubs are frequently located outdoors, although they may be sheltered against sun, rain, wind, or snow.
The Jacuzzi name is commonly used to refer to any bath or hot tub with water jets, and therefore can be considered a genericized trademark. People often refer to a hot tub, spa and/or jetted bathtub as a Jacuzzi, not knowing that Jacuzzi refers to a brand name, not the product itself. Jacuzzi is a company which produces whirlpool bathtubs and spas.
A chemical reaction in which a chemical contaminant like suntan oils, perspiration, or chloramine reacts with any of a number of oxidizing agents, most often breaking up the contaminant and producing a gas which is emitted from the spa water. Result is cleaner water.
A scale which measures the acidity or basicity of water. Ideal range for spa water sanitation is 7.4 – 7.6.
Parts Per Million, a measurement for chemical concentration.
Tablets, powder or liquid material for use in water testing.
Coarse calcium deposits on hot tub wall, floors and circulation plumbing.
A value based on water temperature, total alkalinity, calcium hardness and pH. The value predicts the tendency of hot tub water to be corrosive, neutral or scale-forming.
Adding an oxidizing compound to the hot tub water to chemically break up (oxidize) contaminants such as suntan oils, cosmetics, perspiration and chloramines.
The term “spa” is generally used interchangeably with the term “hot tub.” Spa has traditionally meant a place where water is believed to have special health-giving properties. This is usually a mineral or hot spring. The term is derived from the Belgian town of Spa. The term ‘sanus per aquam’ (spa) is latin for ‘health or healing through water’ and may also have contributed to the current use of the term.
Adding enough chlorine to reach 10ppm free chlorine residual. A method of spa sanitation.
Total Alkalinity (TA)
The amount of the alkaline components in water. TA maintenance acts as a buffer against rapid pH fluctuation. Ideal range 125-150ppm.
Substances introduced in the water by people or the environment that interfere with ideal hot tub water conditions.
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