Understanding grain capacity

Read the operating conditions behind a softener’s capacity figure.

What the number describes

A grain-capacity figure describes a hardness-removal load under stated conditions. It is not the number of gallons the unit can treat under every supply condition. Incoming hardness and the operating programme affect how much water can pass before regeneration.

Do not confuse grains per gallon, a concentration, with total grains of capacity. Record both units clearly when comparing proposals.

Ask about the programmed capacity

A maximum capacity headline may use a different salt dose from the setting recommended for routine operation. Ask for the working capacity, salt use and regeneration water at the proposed programme. Compare figures under like conditions rather than choosing the largest label.

The sizing guide places this number alongside household use and peak flow. Product documentation and qualified sizing advice remain necessary for the specific installation.

Check what the figure does not mean

Capacity is not a certification that a softener removes every contaminant. It does not establish microbial safety or guarantee a particular saving. Read the exact listed claims and the maintenance requirements.

Keep the installation settings with service records so a later reset or controller replacement can be checked against the intended operation.