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Assuming you have followed your owners manual and have tried to correct this problem, the most common cause of cloudy has to do with bather load and changing the water.
The important to remember is that a spa is very different from a swimming pool. Four people in a spa is the equivalent to having 160 people in an average size pool. The typical pool will have about 5000 gallons per swimmer. A 500 gallon spa has only 125 gallons per bather. With the combination of high temperatures and ratio of people to water, problems will occur. The average person leaves behind 2 pints of waste in your spa in a 30 minute period. Residual soaps, deodorants, perfumes and other cosmetics, natural body oils and perspiration are released into the spa water which can cause other organic contaminates.
Filter Cleaning
Many of these contaminates are filtered out by the filter, but not disposed of. This debris needs to be removed by manually cleaning the filter frequently if the bather load is high. The filter should be chemically cleaned each time the water is changed.
Changing the water
Sooner or later the water will be "worn out", looking, feeling or smelling bad. This is an indication it is time to change it.
There is a calculation for frequency of water changes, to give you a rough idea of how often your particular situation requires it.
Total Gallons divided by 3 divided by average bather load = number of days between changes. A bather = anyone using the spa for thirty minutes. One person in the spa for one hour = two bathers, etc.
Example:
A 400 gallon spa is used by 4 bathers per day.
400 gallons divided by 3 = 133
133 divided by 4 daily bathers = 33 days
33 days is the frequency this spa should be changed.
Many people are shocked to learn that their spa requires this frequency of maintenance but remember the pool analogy. If you had 160 people in your pool every day what would it look like?
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