DM Industries Portable Spa Owner's Manual page 21

SYMPTOM
Algae
Eye Irritation
Skin Irritation/Rash
Stains
Scale
PROBABLE CAUSE
High pH
Low free chlorine/bromine
Low pH
Insufficient free available
chlorine/bromine
Unsanitary/polluted water
Chlorine/bromine level too high
(above 5ppm FAC)
pH or total alkalinity too low
High iron or copper in water source
Too much calcium dissolved
in water-pH
SOLUTIONS
Shock with "POTASSIUM PEROXY
MONOSULFATE"; adjust pH.
Shock with "POTASSIUM PEROXY
MONOSULFATE"; maintain sanitizer at
recommended level
Raise pH with "PH-UP".
Shock with "POTASSIUM PEROXY
MONOSULFATE".
Maintain recommended sanitizer residual at
all times; super-chlorinate.
Allow chlorine/bromine level to drop below
5 ppm before using spa.
Adjust pH and total alkalinity; use
sequestering agent; drain and clean with
appropriate product.
Use sequestering agent for metals;
adjust water
Adjust total alkalinity and pH levels by
adding the appropriate sodium bisulfate
product; with concentrated scale deposits,
drain the spa, clean the liner as outlined in
Liner Clean Up), refill the spa and balance
the water.
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