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1. Ideal regeneration frequency is 4 to 6 days at 75% of total capacity. Why 75% capacity? 25% reserve capacity is necessary in case of excessive water use from time to time.

Example:
3 people (75 gallons per person per day) in a home avg. 225 gallons of water used per day with 15GPG will need a 32,000 grain system set up for 24,000 grain capacity.


2.
If you need to convert hardness from ppm to Grains per gallon (GPG) divide the total water hardness  by 17.1.


Example:
200ppm of total hardness / 17.1 = 11.69 GPG


3
. If iron is present in your water supply please add 5 grains of hardness for every 1 ppm of iron and determine your size water softener from there.

There are 17.1 ppm in 1 grain of calcium carbonate per gallon of water. In other words, 1 gpg = 17.1 ppm. Water with 250 ppm = 14.6 gpg (250 divided by 17.1.)

Soft Water is normally less than 1 gpg.
Slightly hard water contains between 1 to 3.5 gpg.
Moderately or medium hard water has 3.5 to 7 gpg.
Hard water contains 7 to 10.5 gpg.
Very Hard - 10.5 and higher gpg.

Prairies order:                                               Eastern order:
Ship from Calgary warehouse                  Ship from Ontario warehouse
  1 TO 2 PEOPLE 3 TO 4 PEOPLE 5 TO 6 PEOPLE 7 TO 8 PEOPLE
5-10 GPG 30,000 GRAIN 30,000 GRAIN 30,000 GRAIN 40,000 GRAIN
11-20 GPG 30,000 GRAIN 30,000 GRAIN 40,000 GRAIN 45,000 GRAIN
21-30 GPG 30,000 GRAIN 40,000 GRAIN 45,000 GRAIN 80,000 GRAIN
31-40 GPG 40,000 GRAIN 60,000 GRAIN 60,000 GRAIN 96,000 GRAIN
41-50 GPG 60,000 GRAIN 80,000 GRAIN 96,000 GRAIN 96,000 GRAIN
51-75 GPG 60,000 GRAIN 80,000 GRAIN 96,000 GRAIN 110,000 GRAIN
76-100 GPG 80,000 GRAIN 96,000 GRAIN 96,000 GRAIN 110,000 GRAIN
Water Softener Chart

HARDNESS IN
GRAINS PER GALLON
NUMBER OF PEOPLE IN THE HOUSE
Pacific Water Softener
" No More Hard Feelings "