Coleman 300 Series Owner's Manual page 32

Common Water Problems (continued)
Problem Cause
Eye Irritation • Low pH
• Insufficient free available chlorine
Skin Irritation/ • Unsanitary/polluted water
Rash
• Soaking too long
• Chemicals not balanced, excessive ozone
Scale • Too much calcium dissolved in water
Erratic pH Test • Sanitizer level too high
Results/Unusual
pH Test Color • Old pH indicator dye
Sanitizer • Excessive organics in water
Dissipating
Too Rapidly • Temperature too high
• Low pH
• Low pH Corrosion of Metal Fixtures
• Low calcium hardness
• Low total alkalinity
Note: If your source water has a high metal or
mineral content, a specialty chemical should be
used to avoid staining or accumulation of deposits.
pH and total alkalinity too high
Solution
• Raise pH with sodium bicarbonate
product.
• Shock with a chlorine sanitizer/shock or
other shock treatment product.
• Keep recommended sanitizer residual at
all times; superchlorinate or use a non-
chlorine shock treatment.
• Soak for smaller intervals, such as 15
minutes.
• Correct chemical imbalance.
• Add a scale control product. Adjust total
alkalinity and pH levels by adding the
appropriate sodium bisulfate product; for
concentrated scale deposits - drain spa,
scrub the scale off, refill the spa and
balance the water.
• Test the pH, when the sanitizer level is
below 5 ppm.
• Replace the pH indicator dye.
• Increase shock dosage; add sanitizer;
shower before entering spa.
• Reduce temperature.
• Raise pH with sodium bicarbonate
product.
• Use chelating agent if metals are present.
Keep proper pH level (7.2 to 7.6).
• Use chelating agent if metals are present.
Maintain minimum 150-200 ppm calcium
hardness.
• Use chelating agent if metals are present.
Maintain proper alkalinity for type of
sanitizer used.
These guidelines cover the most common water
problems when operating a spa with ozone.
Contact your dealer for further information regard-
ing chemical control issues.
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