Use and Care Manual

1
Test and Balance
Troubleshooting
Problem
Green, Black
or Dark Yellow
Algae
Chlorine
Odor
Cloudy
Water
Corrosion
of Metal
Parts
Possible
Causes
•Lowfree
available
chlorine (FAC)
•HighpH
•Lowfree
available
chlorine
•Highcombined
chlorine
•Earlyalgae
growth
•HighpH
•Hightotal
alkalinity
•Poorfiltration
•LowpH
•Lowtotal
alkalinity
•Lowcalcium
hardness
Symptom
•Slipperypool 
surface
•Slimywalls
•Dullgreenwater
•Visiblealgae 
growth
•Watersmellslike
chlorine
•Eyeirritation
•Complaintsof“too
much chlorine in
the water”
•Hazy,cloudywater
•Lackofsparkle
•Metalfixtures
have rust
•Discoloredwater
Solution
1. Adjust pH into the range of 7.2–7.4 with HTH® pH Minus
or HTH pH Plus at least one hour before shocking
2. Shock treat your pool water with an HTH shock product
3. Brush walls vigorously using the HTH 18” Curved
Wall Brush
4. Run filter for 24 hours or until water clears
5. Vacuum
6. Add an HTH algaecide
1. Adjust pH into the range of 7.2–7.4 with HTH pH Minus
or HTH pH Plus at least one hour before shocking
2. Shock treat your pool water with an HTH shock
product
1. Adjust pH into the range of 7.2–7.4 with HTH pH Minus
or HTH pH Plus at least one hour before shocking
2. Shock treat your pool water with an HTH shock
product
Lower pH into the range of 7.2–7.6 (calcium-hypochlorite
based sanitizers) or lower pH into the range of 7.2–7.8
(trichloro-s-triazinetrione based sanitizers) with HTH pH
Minus
Lower total alkalinity with HTH pH Minus
Check filter operation
Raise pH into the range of 7.2–7.6 (calcium-hypochlorite
based sanitizers) or lower pH into the range of 7.2–7.8
(trichloro-s-triazinetrione based sanitizers) with HTH
pH Plus
Raise total alkalinity into the range of 60–120 with
HTH Alkalinity Plus
Raise calcium hardness to a minimum of 200 ppm using
HTH Calcium Plus
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* Please use all products in accordance with label directions.