To calculate the time if the current and required ppm are known (the normal case).

The formula is: Time (mins) = Volume DW (Ltrs) x ppm Ag x 15 / mA on CC meter |

volume (ltrs) x ppm x 15

time = ———————————–

mA

OR

To calculate the ppm if the time and current are known:

The formula is: ppm Ag = Time (mins) x mA on CC meter / Volume DW (Ltrs) x 15 |

time (mins) x mA

ppm Ag = —————————–

volume DW (Ltrs) x 15