Regeneration Frequency and Salt Use by Softener Size

How often each nameplate size regenerates at every hardness, what each salt setting costs in efficiency, and what actually happens during a regeneration cycle.

Every page below is computed rather than written, from the same formulas the matching calculator uses, so a figure on a chart page and the same figure in the calculator cannot disagree. Each one carries its working, the basis of every number it prints, and equipment chosen by those numbers rather than from a general list.

• How often does a 24,000 grain softener regenerate at 5 grains per gallon? A 24,000 grain softener on 5 grain water serving four people regenerates about every 9.5 days at an efficient salt setting. Salt per cycle, salt per year and the efficiency trade off.
• How often does a 24,000 grain softener regenerate at 10 grains per gallon? A 24,000 grain softener on 10 grain water serving four people regenerates about every 4.3 days at an efficient salt setting. Salt per cycle, salt per year and the efficiency trade off.
• How often does a 24,000 grain softener regenerate at 15 grains per gallon? A 24,000 grain softener on 15 grain water serving four people regenerates about every 2.5 days at an efficient salt setting. Salt per cycle, salt per year and the efficiency trade off.
• How often does a 24,000 grain softener regenerate at 20 grains per gallon? A 24,000 grain softener on 20 grain water serving four people regenerates about every 1.6 days at an efficient salt setting. Salt per cycle, salt per year and the efficiency trade off.
• How often does a 24,000 grain softener regenerate at 25 grains per gallon? A 24,000 grain softener on 25 grain water serving four people regenerates about every 1.1 days at an efficient salt setting. Salt per cycle, salt per year and the efficiency trade off.
• How often does a 24,000 grain softener regenerate at 30 grains per gallon? A 24,000 grain softener on 30 grain water serving four people regenerates about every 0.8 days at an efficient salt setting. Salt per cycle, salt per year and the efficiency trade off.
• How often does a 24,000 grain softener regenerate at 40 grains per gallon? A 24,000 grain softener on 40 grain water serving four people regenerates about every 0.3 days at an efficient salt setting. Salt per cycle, salt per year and the efficiency trade off.
• How often does a 32,000 grain softener regenerate at 5 grains per gallon? A 32,000 grain softener on 5 grain water serving four people regenerates about every 13.0 days at an efficient salt setting. Salt per cycle, salt per year and the efficiency trade off.
• How often does a 32,000 grain softener regenerate at 10 grains per gallon? A 32,000 grain softener on 10 grain water serving four people regenerates about every 6.0 days at an efficient salt setting. Salt per cycle, salt per year and the efficiency trade off.
• How often does a 32,000 grain softener regenerate at 15 grains per gallon? A 32,000 grain softener on 15 grain water serving four people regenerates about every 3.7 days at an efficient salt setting. Salt per cycle, salt per year and the efficiency trade off.
• How often does a 32,000 grain softener regenerate at 20 grains per gallon? A 32,000 grain softener on 20 grain water serving four people regenerates about every 2.5 days at an efficient salt setting. Salt per cycle, salt per year and the efficiency trade off.
• How often does a 32,000 grain softener regenerate at 25 grains per gallon? A 32,000 grain softener on 25 grain water serving four people regenerates about every 1.8 days at an efficient salt setting. Salt per cycle, salt per year and the efficiency trade off.
• How often does a 32,000 grain softener regenerate at 30 grains per gallon? A 32,000 grain softener on 30 grain water serving four people regenerates about every 1.3 days at an efficient salt setting. Salt per cycle, salt per year and the efficiency trade off.
• How often does a 32,000 grain softener regenerate at 40 grains per gallon? A 32,000 grain softener on 40 grain water serving four people regenerates about every 0.8 days at an efficient salt setting. Salt per cycle, salt per year and the efficiency trade off.
• How often does a 40,000 grain softener regenerate at 5 grains per gallon? A 40,000 grain softener on 5 grain water serving four people regenerates about every 16.5 days at an efficient salt setting. Salt per cycle, salt per year and the efficiency trade off.
• How often does a 40,000 grain softener regenerate at 10 grains per gallon? A 40,000 grain softener on 10 grain water serving four people regenerates about every 7.8 days at an efficient salt setting. Salt per cycle, salt per year and the efficiency trade off.
• How often does a 40,000 grain softener regenerate at 15 grains per gallon? A 40,000 grain softener on 15 grain water serving four people regenerates about every 4.8 days at an efficient salt setting. Salt per cycle, salt per year and the efficiency trade off.
• How often does a 40,000 grain softener regenerate at 20 grains per gallon? A 40,000 grain softener on 20 grain water serving four people regenerates about every 3.4 days at an efficient salt setting. Salt per cycle, salt per year and the efficiency trade off.
• How often does a 40,000 grain softener regenerate at 25 grains per gallon? A 40,000 grain softener on 25 grain water serving four people regenerates about every 2.5 days at an efficient salt setting. Salt per cycle, salt per year and the efficiency trade off.
• How often does a 40,000 grain softener regenerate at 30 grains per gallon? A 40,000 grain softener on 30 grain water serving four people regenerates about every 1.9 days at an efficient salt setting. Salt per cycle, salt per year and the efficiency trade off.
• How often does a 40,000 grain softener regenerate at 40 grains per gallon? A 40,000 grain softener on 40 grain water serving four people regenerates about every 1.2 days at an efficient salt setting. Salt per cycle, salt per year and the efficiency trade off.
• How often does a 48,000 grain softener regenerate at 5 grains per gallon? A 48,000 grain softener on 5 grain water serving four people regenerates about every 20.0 days at an efficient salt setting. Salt per cycle, salt per year and the efficiency trade off.
• How often does a 48,000 grain softener regenerate at 10 grains per gallon? A 48,000 grain softener on 10 grain water serving four people regenerates about every 9.5 days at an efficient salt setting. Salt per cycle, salt per year and the efficiency trade off.
• How often does a 48,000 grain softener regenerate at 15 grains per gallon? A 48,000 grain softener on 15 grain water serving four people regenerates about every 6.0 days at an efficient salt setting. Salt per cycle, salt per year and the efficiency trade off.
• How often does a 48,000 grain softener regenerate at 20 grains per gallon? A 48,000 grain softener on 20 grain water serving four people regenerates about every 4.3 days at an efficient salt setting. Salt per cycle, salt per year and the efficiency trade off.
• How often does a 48,000 grain softener regenerate at 25 grains per gallon? A 48,000 grain softener on 25 grain water serving four people regenerates about every 3.2 days at an efficient salt setting. Salt per cycle, salt per year and the efficiency trade off.
• How often does a 48,000 grain softener regenerate at 30 grains per gallon? A 48,000 grain softener on 30 grain water serving four people regenerates about every 2.5 days at an efficient salt setting. Salt per cycle, salt per year and the efficiency trade off.
• How often does a 48,000 grain softener regenerate at 40 grains per gallon? A 48,000 grain softener on 40 grain water serving four people regenerates about every 1.6 days at an efficient salt setting. Salt per cycle, salt per year and the efficiency trade off.
• How often does a 64,000 grain softener regenerate at 5 grains per gallon? A 64,000 grain softener on 5 grain water serving four people regenerates about every 27.0 days at an efficient salt setting. Salt per cycle, salt per year and the efficiency trade off.
• How often does a 64,000 grain softener regenerate at 10 grains per gallon? A 64,000 grain softener on 10 grain water serving four people regenerates about every 13.0 days at an efficient salt setting. Salt per cycle, salt per year and the efficiency trade off.
• How often does a 64,000 grain softener regenerate at 15 grains per gallon? A 64,000 grain softener on 15 grain water serving four people regenerates about every 8.3 days at an efficient salt setting. Salt per cycle, salt per year and the efficiency trade off.
• How often does a 64,000 grain softener regenerate at 20 grains per gallon? A 64,000 grain softener on 20 grain water serving four people regenerates about every 6.0 days at an efficient salt setting. Salt per cycle, salt per year and the efficiency trade off.
• How often does a 64,000 grain softener regenerate at 25 grains per gallon? A 64,000 grain softener on 25 grain water serving four people regenerates about every 4.6 days at an efficient salt setting. Salt per cycle, salt per year and the efficiency trade off.
• How often does a 64,000 grain softener regenerate at 30 grains per gallon? A 64,000 grain softener on 30 grain water serving four people regenerates about every 3.7 days at an efficient salt setting. Salt per cycle, salt per year and the efficiency trade off.
• How often does a 64,000 grain softener regenerate at 40 grains per gallon? A 64,000 grain softener on 40 grain water serving four people regenerates about every 2.5 days at an efficient salt setting. Salt per cycle, salt per year and the efficiency trade off.
• How often does a 80,000 grain softener regenerate at 5 grains per gallon? A 80,000 grain softener on 5 grain water serving four people regenerates about every 34.0 days at an efficient salt setting. Salt per cycle, salt per year and the efficiency trade off.
• How often does a 80,000 grain softener regenerate at 10 grains per gallon? A 80,000 grain softener on 10 grain water serving four people regenerates about every 16.5 days at an efficient salt setting. Salt per cycle, salt per year and the efficiency trade off.
• How often does a 80,000 grain softener regenerate at 15 grains per gallon? A 80,000 grain softener on 15 grain water serving four people regenerates about every 10.7 days at an efficient salt setting. Salt per cycle, salt per year and the efficiency trade off.
• How often does a 80,000 grain softener regenerate at 20 grains per gallon? A 80,000 grain softener on 20 grain water serving four people regenerates about every 7.8 days at an efficient salt setting. Salt per cycle, salt per year and the efficiency trade off.
• How often does a 80,000 grain softener regenerate at 25 grains per gallon? A 80,000 grain softener on 25 grain water serving four people regenerates about every 6.0 days at an efficient salt setting. Salt per cycle, salt per year and the efficiency trade off.
• How often does a 80,000 grain softener regenerate at 30 grains per gallon? A 80,000 grain softener on 30 grain water serving four people regenerates about every 4.8 days at an efficient salt setting. Salt per cycle, salt per year and the efficiency trade off.
• How often does a 80,000 grain softener regenerate at 40 grains per gallon? A 80,000 grain softener on 40 grain water serving four people regenerates about every 3.4 days at an efficient salt setting. Salt per cycle, salt per year and the efficiency trade off.

Researched, not professional advice. Every figure on these pages is labeled as a published standard, a trade rule of thumb, or something that can only come off your own water test. Where a published figure does not exist we say so rather than estimating one. Test your water before you buy equipment: on city water start with the Consumer Confidence Report your utility publishes each year, and on a private well only a certified laboratory test tells you what you have. Bacteria, nitrate, lead, arsenic and PFAS are not do it yourself topics and need a laboratory and usually a licensed professional.