How to Size Your Water Softener - Sizing the Best Water Softener for Your Needs - Calculating GPG and Grain Capacity

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How to Size Your Water Softener

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Formula for Calculating GPG and Grain Capacity

*Round up where applicable.
Note: If hardness is measured in MG/L or PPM divide it by 17.1 to convert to GPG.

X

X

{

+

}

If City Water, Enter 0 for Iron

Total Grains Per Day That Must Be Removed:

What do your results mean?
Note: Calculations are based upon your softener regenerating on an average of every seven days.

If Your Daily Grain Requirements Are:		You Need a Water Softener With:
0 - 3,500 Grains Per Day	----	24,000 Grain Capacity
3,501 - 4,500 Grains Per Day	----	32,000 Grain Capacity
4,501 - 5,750 Grains Per Day	----	40,000 Grain Capacity
5,751 - 6,850 Grains Per Day	----	48,000 Grain Capacity
6,851 - 9,150 Grains Per Day	----	64,000 Grain Capacity
9,151 - 11,500 Grains Per Day	----	80,000 Grain Capacity
11,501 - 13,700 Grains Per Day	----	96,000 Grain Capacity
13,701 - 15,700 Grains Per Day	----	110,000 Grain Capacity

Learn More

Now You Know the Water Softener Size, Next Step is Picking the Valve Size. >
Click Here to Find Your Water Hardness. >
Water Softener FAQ's >
How Does a Water Softener Work >

This GPG calculator was developed by Clay Butler and Rob Chevalier and is Copyright 2006 Quality Water Treatment

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How to Size Your Water Softener - Find the Best Water Softener for Your Needs - Calculating GPG and Grain Capacity - Water Softener Size Guide