Free Chlorine

Free Chlorine (FC) is a measure of the concentration of chlorine available to sanitize spa water. Chlorine is effective at killing bacteria, viruses, and other contaminants in the water.

Free Chlorine is the portion of total chlorine that has not combined with other chemicals in the water to form chloramines or other compounds. The recommended range for Free Chlorine in a spa is between 1 and 3 ppm, although this can vary depending on factors such as bather load, water temperature, and sunlight exposure.

Gecko waterlab will test ORP over 1000 times per week and will recommend adjusting your Free Chlorine levels to ensure proper water sanitation and maintain safe and comfortable bathing conditions. If the ORP level is too low, the water can become cloudy or green, and spa users may be at increased risk of waterborne illness. If the ORP level is too high, it can cause eye and skin irritation in bathers and may damage spa equipment and surfaces.

To adjust the Free Chlorine level, spa owners can add chlorine directly to the water, either in the form of tablets, granules, or liquid. It is important to follow the manufacturer's instructions for the specific type of chlorine being used and to avoid over-treating the water.