N.P.I. Nordic Hot Tubs IMPULSE, Owner'S Manual

COMMON WATER Q & A

26

     |     NORDIC HOT TUBS     |     OWNER’S MANUAL

PROBLEM

CAUSE

SOLUTION

Calcium deposits 

on the shell surface

•  Hard water.

•  pH, total alkalinity not in balance

Clean with a non-abrasive hot tub surface cleaner. 
Test water, adjust pH as needed. 
Add a stain and scale control chemical

Cloudy water

•  pH, total alkalinity not in balance.

•  Damages or dirty filer

•  Addition of incompatible 

chemicals

•  Low chlorine level

•  Buildup of oils, soap, foreign 

matter

Add a water clarifier. Circular for a minimum of 30 minutes.
Add water has cleared, clean filter cartridge with a filter 

cleaner or replace if necessary. Test chlorine and pH levels, 

adjust if necessary. 
Change water.

Colored water

•  Copper or iron metals in Hot Tub 

due to water supply or corrosion of 

heater.

•  Total alkalinity, pH are low.

Add an iron/stain and scale remover.
Test pH, adjust if necessary.

Excessive foam

•  pH, total alkalinity not in balance

•  Low calcium hardness

•  Inadequate oxidation

•  Addition of incompatible 

chemicals

 • Buildup of body oils and/or 

contaminants

Add an anti-foam agent.
Add shock.
Adjust chlorine level.
Test pH, adjust if necessary.
Take water sample to dealer to check total alkalinity and 

calcium hardness. Change water.

Eye and skin 

irritation

•  pH, total alkalinity not in balance

•  Inadequate chlorine level

•  Addition of incompatible 

chemicals

Test pH and chlorine levels, adjust if necessary

Odor

•  Inadequate ventilation

•  Addition of incompatible 

chemicals

•  Insufficient oxidation

•  Inadequate cleaning of cover.

•  Low pH.

•  Chemical overdose

Test pH and chlorine levels, adjust if necessary.
Clean with non-abrasive hot tub surface cleaner.
Clean the underside of the cover with a cover cleaner or 

mild soap and warm water.
Add shock.

Waterline deposits 

and staining

•  Buildup of body oils, impurities

•  Use of clarifying agents with ozone.

•  Hard water (minerals in water).

Test pH and chlorine levels, adjust if necessary.
Clean with non-abrasive hot tub surface cleaner.
Add a scale/stain control chemical.
Take water sample to your dealer