Free Chlorine Lower Than Total Chlorine. Free chlorine lower than total chlorine. On the other hand, if the free chlorine level is lower than the total chlorine level, you can use that to calculate the combined chlorine level.
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Fac + cac = tc. It’s because free chlorine is 25 times more effective at sanitizing pool water than used up combined chlorine is. If total chlorine is higher than free chlorine, there are contaminants in the pool.
Samples with ph of 7.6 or above may have 250 ppm alkalinity or above.
Your total chlorine should actually measure the exact same as your free chlorine. That means you have too much combined chlorine, which could lead to chlorine lock and ineffective sanitizing. You can't put 10 gallons of water in a 5 gallon bucket. These are the good parts of chlorine that are active and able to change chemically to sanitize your pool.
