Bought a case from AllFilters website earlier this year. Only used one, these are the other 11. Price is for all 11.
From AllFilters site:
The SpiroPure SP-WS-10 Water Softening Cartridge reduces hardness minerals and scale deposits and are ideal for low flow rate residential and commercial applications. SP-WS-10 is a high quality replacement water softening resin filter cartridge compatible with systems that currently use 10" filter cartridges.
Cations, sodium-form resin ion-exchange media with polypropylene pre and post filters
Uses a bed of sodium form cation resin beads to reduce hardness and scale deposits
Filter dimensions are 2.5" D x 10" L
Recommended flow rate of ≤ 2.5 gpm (9.5 lpm)
Temperature rating of 40°F to 100°F (4.4°C to 37.8°C)
Capacity of 750 grains