EWT G20 Owner's Manual page 20

OPERATION DURING A POWER FAILURE
In the event of a power failure, the valve will keep track of the time and day. The programmed settings
are stored in a non-volatile memory and will not be lost during a power failure. If power fails while the
unit is in regeneration, the valve will nish regeneration from the point it is at once power is restored.
If the valve misses a scheduled regeneration due to a power failure, it will queue a regeneration at the
next regeneration time once power is restored.