The short answer
Pellets suit most softeners with the least residue; solar crystals cost less; blocks are only for softeners designed for them.
Side by side
| Pellets | Solar crystals | Blocks | |
|---|---|---|---|
| Residue | Least | Some | Varies |
| Bridging | Possible | Possible | N/A |
| Use in | Most softeners | Most softeners | Only units made for blocks |
Pellets and crystals we cover
Pellets: Morton 1499 25 lb Softener Salt Pellets, Diamond Crystal Bright & Soft Softener Salt Pellets. Crystals: Snow Shield 50 lb Solar Salt Crystals, Diamond Crystal Solar Naturals 40 lb Solar Salt Crystals.
Check the manual
Cabinet units with a small brine well can have maker preferences; follow them.
Products mentioned
Questions readers ask
Are pellets or crystals better for a water softener?
Pellets leave less residue; crystals cost less; most softeners take either.
Can I use salt blocks in my softener?
Only if the maker says the unit takes blocks.