What are the proper chemical ranges for your Hot Tub

Written by Hot Tub Repair Expert on . Posted in News, Blog and Tips

These are the guidelines from the National Swimming Pool Foundation.  When testing your hot tub, used these.  If you have a question, contact SpaTek.

Parameter

Min.

Ideal

Max.

Free Chlorine, ppm

2.0

3.0-5.0

10.0

Combined Chlorine, ppm

0

0

0.5

Total Bromine, ppm

2.0

4.0-6.0

10.0

pH

7.2

7.4-7.6

7.8

Total Alkalinity, ppm

60

80-100* 100-120**

180

Total Dissolved Solids, ppm

NA

NA

1,500 over start-up

Calcium Hardness, ppm as CaCO3

100

150-250

800

Heavy Metals

None

None

None

Visible Algae

None

None

None

Bacteria

None

None

Local code

Cyanuric Acid, ppm (if used)

0

30-50

***

Temperature, °F



Personal preference

104°F

Ozone, ppm





0.1 over 8-hr.
time wtd. avg.



* For spas sanitized with calcium hypochlorite, lithium hypochlorite, or sodium hypochlorite
** For spas sanitized with sodium dichlor, trichlor, BCDMH, or chlorine gas
*** Dictated by state or local codes. Typically 100 ppm. (Some codes higher, others lower.)
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