When to drain the spa ?

05 March 2015

When do you have to drain the spa ?

You have to drain the spa when it has a high level (> 3 000 ppm) of TDS (total dissolved solids) or combined to a high level of chlorine.

Here is the formula :

(Number of gallons / 3) / (Number of swimmers / 24 h) = days of continuous operation

Here is an example of a spa of 8 feets of diameter; 3 feet on depth; average of 4 swimmers/24 hours :

(1 128 / 3) / (4) = 94 days (3 months)

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