Water Softener Calculator By Tank Size And Hardness Level

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Millipore and Barnstead Laboratory Water Filtration

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If you need a new water softener try our
Water Softener Selection Calculator

Enter the height and width of your exisitng Water Softener.
This calculator will give you all the information you need
to set up a timer or meter based water softener.

Softener Tank Width In Inches
Softener Tank Height In Inches
Total Water Hardness (Grains per gallon)

Your Water Softener Capacity Specification

Ft³ of Resin Lbs. of salt per Ft³ Capacity in Grains Capacity in Gallons Lbs. of salt per regeneration Gallons
per lb of salt

1.00 15 31,934 3,193 15.0 185.4

1.00 10 26,944 2,694 10.0 234.7

1.00 8 23,950 2,395 8.0 300.0

1.00 6 19,959 1,996 6.0 333.3

Use The Above Settings To Set Up A Meter Based Water Softener
Ft³ = Cubic Feet

The maximum flow rate for this softener is 7.4 Gallons Per Minute.

Settings To Use For a Timer Based Water Softener

For Residential Users

Number of days the softener should last between regenerations
@ 6 lbs. Salt Setting
People in Residence Days

1 24.9

2 12.5

3 8.3

4 6.2

5 5.0

6 4.2

7 3.6

8 3.1

9 2.8

10 2.5

Based on The National Average of
80 Gallons Per Day Per Person

For Residential Users

Number of days the softener should last between regenerations
@ 8 lbs. Salt Setting
People in Residence Days

1 29.9

2 15.0

3 10.0

4 7.5

5 6.0

6 5.0

7 4.3

8 3.7

9 3.3

10 3.0

Based on The National Average of
80 Gallons Per Day Per Person

For Residential Users

Number of days the softener should last between regenerations
@ 10 lbs. Salt Setting
People in Residence Days

1 33.7

2 16.8

3 11.2

4 8.4

5 6.7

6 5.6

7 4.8

8 4.2

9 3.7

10 3.4

Based on The National Average of
80 Gallons Per Day Per Person

For Residential Users

Number of days the softener should last between regenerations
@ 15 lbs. Salt Setting
People in Residence Days

1 39.9

2 20.0

3 13.3

4 10.0

5 8.0

6 6.7

7 5.7

8 5.0

9 4.4

10 4.0

Based on The National Average of
80 Gallons Per Day Per Person

Calculator Assumptions

Usable Softener Resin Capacity is 32,000 Grains per ft³ at 15 lbs per ft³ salt charge
The maximum flow rate for Water Softener Resin Is 7 gallons per minute per ft³

Softener is 65% full of resin beads

If you do not know how hard your water is, you can use this map to get a rough idea.

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