25
Capacity Calculation
To treat the water properly, the contaminant levels will need to be known to determine the
amount of gallons that can be used between regeneration cycles. The supplied hardness
test strips can be used to determine the feed water hardness level. Once that is known,
there is a calculation that will determine the number of gallons that can be treated. Here is
that formula;
System Capacity / Hardness Level = Gallons of Capacity
The chart below can help determine the capacity.
Example;
Hardness Level: 23 GPG
EPWS - 2 System Capacity: 22,000 Grains
22,000 Grains / 23 Grains per Gallon =
957 Gallons of Capacity
This would indicate that
957
gallons of water can be treated before a regeneration cycle is
necessary.
NOTE: If there is iron in the water, add 5 GPG to the hardness level. If you have an
actual iron value or an iron test kit, add 1 GPG for every ppm of iron present.
Example;
Hardness Level: 14 GPG
Iron Present: 5 GPG
Compensated Hardness: 19 GPG
EPWS - 1 System Capacity: 10,000 Grains
10,000 Grains / (14 GPG + 5 GPG) = Gallons
10,000 Grains / 19 GPG =
526 Gallons of Capacity
This would indicate that
526
gallons of water can be treated before a regeneration cycle is
necessary.
The amount of gallons used will be determined by the end user. Either a know amount of
storage tank space can be used to calculate it or an inline water meter will be needed to
track the amount of gallons treated through the system.
NOTE: The system should be backwashed and regenerated each time a new water
source is used or the system is used after sitting dormant for a period of time.
Model Number
Capacity
091-EPWS-1
10,000 Grains
091-EPWS-2
22,000 Grains
