Number of people in your house
|Hardness in Grains Per Gallon||1 to 2 people*||3 to 4 people*||5 to 6 people*||7 to 8 people*|
|5-10 GPG||32,000 Grain||32,000 Grain||40,000 Grain||48,000 Grain|
|11-20 GPG||32,000 Grain||40,000 Grain||48,000 Grain||64,000 Grain|
|21-30 GPG||32,000 Grain||48,000 Grain||64,000 Grain||80,000 Grain|
|31-40 GPG||48,000 Grain||64,000 Grain||64,000 Grain||96,000 Grain|
|41-50 GPG||64,000 Grain||80,000 Grain||96,000 Grain||110,000 Grain|
|51-75 GPG||64,000 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|
Knowing your water and usage is vital to purchasing the correct water softener. A water softener that is too small will not be able to keep up with your needs and will wear it down faster. High grain water softeners cost more money and an over-sized softener means wasted money. This page will help you determine the right size water softener for you.
We recommend contacting them directly first for information about your water hardness. Most providers provide water hardness information on their website or will provide if contacted.
Learn what your water hardness is and more with our free water test kit.Request Free Kit
Ideal regeneration frequency is 5 to 7 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.
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
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.