The short answer
Penn State Extension estimates about 50 gallons per regeneration cycle; weekly use depends on how often your unit regenerates.
Per regeneration
About 50 gallons per cycle (Penn State Extension). A unit regenerating weekly uses about 50 gallons a week; one regenerating every two days about 175.
Cutting it
- A metered valve regenerates on gallons used, not on a timer.
- A unit sized for about a week of your load regenerates less often.
- Check your interval with the regeneration calculator.
Septic systems
Penn State Extension suggests septic owners consider the extra load on the drain field from backwash and regeneration water.
Products mentioned
Questions readers ask
Does a water softener waste a lot of water?
About 50 gallons per regeneration; a right-sized metered unit keeps the number of regenerations down.
Can a softener drain into a septic system?
Many do; Penn State advises considering the added load on the drain field. Follow local code.