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Sizing & Math

Grains per day, capacity, and regeneration math with every assumption shown.

How to Size a Water Softener: Grains Per Day Math, Step by Step

Work out grains per day from your hardness and household, pick a capacity, and check flow rate. Worked examples plus dated prices from official pages.

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Know Your Water

How to find your hardness and other results from a water report or a lab test.

Know your water

How to Find Your Water Hardness: Water Reports, Test Strips, and Lab Tests

Where to find your hardness number, how to convert ppm/mg/L to grains per gallon, and when a certified lab test is the right move.

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Certifications

What NSF/ANSI standards actually certify, and how to check a listing yourself.

Certifications

NSF/ANSI 42, 44, 53, 58, 61: What Water Treatment Certifications Mean

A plain-English guide to the NSF/ANSI standards on softeners and filters, the difference between certified systems and certified components, and how to check a listing.

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