6
Problem
Description
Cause
Remedy
Green Algae
1. Green water
2. Green spots on
surface
3. Slippery surface
1. Low ozone,
bromine or
chlorine levels
2. Low algaecide
levels
1. Superchlorinate
2. Brush spa (removing
algae)
3. Vacuum spa (removing
algae)
4. Increase oxidizer
residual
5. Increase algaecide level
Black Algae
1. Black spots on spa
surface
1. Low
oxidizer
levels
2. Low
algaecide
levels
1. Superchlorinate
2. Brush spa (removing
algae)
3. Increase ozone, chlorine
or bromine residual
4. Increase algaecide level
Unpleasant Odor
Burning Eyes
1. Chlorine-like odor
2. Burning sensation
in eyes
1. Combined
chlorine;
2. pH out of
balance
1. Balance pH to 7.2-7.6
2. Superchlorinate
Colored Water
1. Water in newly
filled spa turns
black, blue or
brown when first
treated with ozone
1. Copper, iron,
or manganese
in water being
oxidized by
chlorine or
ozone
1. Adjust pH to 7.2-7.6
2. Run filter continuously
and clean as required
3. Vacuum settled material
4. Use sequestering agent
for prevention
Hard Water
1. Cloudy water
2. Scaling
1. Excessive
hardness of
makeup water
or building up
of dissolved
minerals in the
water caused
by continued
use of spa
chemicals
1. Clean filter
2. Filter continuously
3. Adjust pH to 7.2-7.6
4. Use scale inhibitor
5. Dilute with makeup
water
TROUBLESHOOTING
