Balancing Total Dissolved Solids (TDS)

Balancing Total Dissolved Solids (TDS) in a spa should not exceed 2500 ppm, or 1500 ppm over the level naturally occurring in the fill water. If it is higher than this, a drain would be appropriate.

Note: This information is intended for a residential spa with average use. It is not designed for public, commercial, or semi-public spas. If your hot tub is used more than three times per week, you should check and make chemical additions more often than suggested.