TERM DEFINITION
Chlorine
Free Chlorine (FCL)
FCL is the active form of chlorine that actually kills bacteria and algae (It is a Sani-
tizer).
Sanitizer is extremely important for killing algae, bacteria and viruses, and prevent-
ing unwanted organisms for growing in the spa. At the same time, you don’t want
too high a sanitizer level, or it can irritate your skin, lungs and eyes.
Always maintain the sanitizer level in your spa within the recommended range.
Also refer ORP
Chlorine Residual The actual level of chlorine in the water after the chlorine demand has been satis-
ed.
Sanitizer Chemical used to kill bacteria.
Generic names: Chlorine, Bromine and Biguanide.
Arctic Pure, Boost
Adding Arctic Pure BOOST should be avoided unless the CI level is very low.
Parts Per Million (ppm) ppm: parts per million, a standard measure of chemical or mineral concentration.
Organic waste Debris such as microorganisms, perspiration, urine, etc. which needs to be burned
up or “oxidized” regularly to prevent haze, algae, chloramines, etc.
Shock An oxidizer that “burns o” the organic wastes which cause cloudiness and algae. It
is a generic term for a chemical used to oxidize organic wastes. Arctic Pure, Boost.
1.9 Water Chemistry Abbreviations/Acronyms & Levels
ABBREVIATION/ACRONYMS
DEFINITION CORRECT CHEMICAL LEVELS
CH Calcium Hardness 50 - 150 ppm
TA Total Alkalinity 80-100 ppm
pH Potential Hydrogen 7.2 – 7.6 ppm
FCL Free Chlorine 1 – 3 ppm
ORP Oxidation–Reduction Potential 600 - 1000
101101
Understanding Onzen™
Owners Manual - Onzen™
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