Free Chlorine Vs Total Chlorine Hot Tub. Total chlorine is the amount of free chlorine plus combined chlorine in the spa. Slowly pour the chlorine granules into your hot tub as the pump is running.
The free chlorine level in your hot tub should be between 1 and 3 ppm (parts per million). But for other sizes, add about 1.25 oz (35g) of chlorine shock per 400 gallons (1500 liters). When chlorine binds up with contaminants it forms a compound called “chloramines” that are still part of the total but no longer effective.
Another way to figure the combined chlorine level is to subtract the total chlorine level from free chlorine level, provided the total chlorine is higher than the free chlorine.
But for other sizes, add about 1.25 oz (35g) of chlorine shock per 400 gallons (1500 liters). Free chlorine is added in order to clean and sanitize your water. Routine water care is key to avoiding hot tub water problems. But with a little thought and.
