Water Softener Salt: Types, How Much You Need, and Fixing Salt Bridges

Salt is the only routine consumable in a softener, and it is where most homeowners create problems for themselves. Cheap salt with high insoluble content is the leading cause of service calls we could have avoided.

The main types

• Evaporated pellets: highest purity, lowest residue, best all-around choice
• Solar crystal salt: solar-evaporated sea salt, less pure, more sediment in the brine tank
• Rock salt: cheapest and dirtiest, leaves mud in the tank and clogs the injector
• Block salt: only for softeners specifically designed for it
• Potassium chloride: sodium-free alternative, costs more, works well for sodium-restricted households

How much salt should I be using?

It depends on hardness, household size and how the valve is programmed. What matters more than the number is the trend: if your usage suddenly jumps, something changed — a leaking toilet, a valve stuck in regeneration, or a control programmed with the wrong hardness setting.

How full should the brine tank be?

Keep it roughly one third to one half full and above the water line. Filling it to the brim invites bridging and lets salt sit long enough to cake.

Salt bridges and salt mush

A salt bridge is a hard crust that forms across the tank with an empty void underneath. Water never touches the salt, no brine is made, and hard water starts coming through even though the tank looks full.

• Tap the outside of the tank; a hollow sound suggests a bridge
• Use a broom handle, not metal, to break the crust gently — never strike the tank or the brine well
• Scoop out mushy salt from the bottom and restart with clean pellets
• Prevent recurrence by using purer salt and keeping the tank less full

Annual habits that keep it healthy

• Let salt run low once a year and clean out residue
• Check that the brine line and float are clear
• Verify the hardness setting still matches your tested water
• Confirm the bypass valve is in service position after any plumbing work

BlueWell Water Co tests hardness, chlorine and TDS at your kitchen sink for free anywhere in the San Antonio area, then quotes only the equipment your house actually needs.