Quick Answer: A metered (on-demand) softener counts the gallons you actually use and regenerates only when the resin is close to spent, so it uses less salt and water than a timer unit. Our top pick is the Fleck 5600SXT 48,000 grain: the most widely serviced metered valve, on the right-size tank for most homes. For bigger families, the same valve on a 64k tank is the classic choice. If you use water at all hours, the twin-tank Fleck 9100SXT never goes offline.
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If you're buying a new softener in 2026, a timer model is hard to find. Nearly every whole-house system sold today is "on demand" in some form. The real differences are in how the softener decides, when it acts, and whether you can set it up for your house. A metered softener with bad settings can still waste nearly as much salt as an old timer unit.
So this page is about the meter and its settings. The hardware matters too, but the settings decide whether you actually save money.
In this guide
Three kinds of "on demand"
1. Timer (time-clock). Regenerates every X days whether you used 200 gallons or 2,000. A week away still costs you a full regeneration. Avoid it unless you have a specific reason, like seasonal use with a known, steady load.
2. Metered (volumetric). A turbine in the valve counts gallons. You enter hardness and capacity, the valve works out how many gallons the bed can soften, and it regenerates when you've used that many. Fleck 5600SXT, Fleck 9100SXT, Clack WS1 and Genesis units work this way. It's predictable, it's transparent, and you can adjust it.
3. Demand-initiated with variable salting (DIR). Cabinet-style brands like Morton and Whirlpool track your usage pattern and adjust both when to regenerate and, on some models, how much salt to use. Whirlpool's WHES40 manual, for example, lists salt doses from 3.4 to 15.5 lb. These are easy to live with, but you see less of what's going on, and the parts are proprietary.
For most DIY buyers, a plain metered valve (type 2) on a correctly sized tank is the sweet spot. Our explainer on how a softener control valve works shows the meter and piston in more detail.
The setting that makes or breaks salt savings: reserve
A metered softener doesn't wait until the resin is completely empty. Most are set to delayed regeneration. When the remaining capacity drops below a reserve, the valve schedules a regeneration for 2 a.m. The reserve covers whatever water you use between "almost empty" and 2 a.m.
- Too little reserve: hard water slips through the evening before regeneration.
- Too much reserve: you regenerate with a lot of capacity left and throw away salt.
A sensible starting point is about one day's water use as reserve. On many valves you can let the controller calculate it. Our guide to softener reserve capacity has the math, and what time a softener should regenerate covers the clock side.
Five metered softeners worth buying
| Pick | Valve | Capacity | Meter style | Downtime during regen? |
|---|---|---|---|---|
| Fleck 5600SXT 48k | Fleck 5600SXT | 48,000 (1.5 cu ft) | Metered, delayed or immediate | Yes, short |
| Fleck 5600SXT 64k | Fleck 5600SXT | 64,000 (2 cu ft) | Metered, delayed or immediate | Yes, short |
| Fleck 9100SXT twin | Fleck 9100SXT | 64,000 per tank | Metered, immediate alternating | No |
| Genesis 2 HE 24k | Genesis digital metered | 24,000 | Metered, upflow brining | Yes, short |
| Kenmore 350 | Kenmore proprietary valve | 32,000 | Demand-initiated (IntelliSoft) | Yes, short |
Fleck 5600SXT 48,000 Grain loaded tank: best overall
The 5600SXT is the valve most water treatment techs have serviced more than any other, and parts are stocked everywhere. This system pairs the digital SXT controller and its paddle-wheel meter with 1.5 cubic feet of 8% crosslink resin in a 10" x 54" tank, already loaded so you skip the funnel job. The listing rates it for up to 12 gpm service flow (28 gpm peak) and up to 6 people on moderate to very hard water.
The box includes a 15" x 36" brine tank with safety float, the Fleck bypass valve and a 1" male threaded yoke, plus a kit with sanitizer, silicone lubricant and hardness test strips. Like every metered unit here, it regenerates on gallons, not days. The SXT also has a days-override setting so it still regenerates if a vacation house sits unused. That keeps the resin from sitting stagnant.
Watch for: 5600SXT systems are assembled by many different sellers. The resin quality and the brine tank can vary even when the valve is the same. Read the listing details, and keep the seller's paperwork.
AFWFilters Fleck 5600SXT 64k: best for larger families
At 5+ people or 20+ gpg, a 48k softener starts regenerating every couple of days, and that eats into the metered savings. This AFWFilters system puts the same 5600SXT digital meter valve on a 64,000-grain tank with 2 cubic feet of resin. That's enough to stretch regenerations to every 4–6 days in most big households. It ships as a matched kit with the valve, resin tank, bypass valve and a brine tank with a safety float, and the manufacturer warranty covers both the valve and the tank.
Same valve as the 48k pick means the same huge parts ecosystem. That's a big plus for a softener you'll keep for 15 years.
Watch for: the meter is accurate, but the SXT's capacity setting is only as good as the hardness you enter. Programming it with a guessed hardness is the most common reason these "use too much salt."
Fleck 9100SXT Twin Tank: best for irregular or 24/7 use
Single-tank metered softeners still have one weakness. If water use is heavy at 2 a.m. (night-shift households, a home business, or a family that runs laundry and the dishwasher overnight), the scheduled regeneration either hits that use or gets pushed into it. The 9100SXT gets rid of the problem. It meters each tank, switches to the fresh one the moment capacity runs out, and regenerates the spent tank immediately. You don't need a reserve at all, because the second tank is the reserve.
Suppliers list 2.0 cubic feet of 10% crosslink resin per tank and about 13 gpm service flow on this configuration.
Watch for: space and weight. Two mineral tanks plus a brine tank take up a lot of floor. It's also overkill for a couple at 10 gpg.
Genesis 2 High Efficiency 24k: best for small households
Small homes have a hidden problem with metered softeners. With low water use, a big tank goes many days between regenerations, and the resin can sit in stagnant water. A 24k bed is a better match for 1–2 people. The Genesis 2 HE adds upflow brining on top of the meter, so the brine reaches the resin at the outlet end first. The goal is lower hardness leakage at modest salt doses.
Watch for: the seller's efficiency claims come from the seller. The meter-initiated regeneration does most of the salt-saving work, and the upflow design adds a smaller benefit. Also, Genesis uses its own control rather than a Fleck or Clack, so servicing goes through the seller.
Kenmore 350: best set-and-forget unit
Some people don't want to know what "reserve capacity" means. The Kenmore 350 is demand-type: its IntelliSoft control learns your household's water use and regenerates only when needed, and it monitors the salt level for you. It's compact for tight spaces, uses a 3/4" high-flow valve, and has a digital display for flow rate and salt level. Kenmore sizes it for 1–4 people, says it also reduces clear-water iron, and covers it for 1 year in full, 3 years on electronics and 10 years on the tank.
Watch for: 32,000 grains is small for big families or very hard water, and the valve is proprietary. If you like to tinker, get a Fleck instead.
How much does metering actually save?
It depends on how far your usage swings. A steady household that a timer happened to match well might save little. A family that travels, has kids home for summers, or has a big seasonal swing saves a lot, because a timer regenerates on a schedule whether anyone's home or not.
Rough illustration: a timer set to every 3 days runs about 120 regenerations a year. A metered unit in the same house might average every 4–5 days once actual use is counted, and it skips the weeks you're away. That works out to something like 75–90 regenerations, and each one skipped saves its full salt dose and drain water. On top of that, a lower salt setting (more grains per pound) adds more savings. Our guide to optimizing a softener for salt and water efficiency shows how to tune it.
Common questions about metered softeners
Does a metered softener need power? Yes. Every pick above uses an outlet for its controller and drive motor, but only a few watts. The exception is water-powered twin-tank designs, which are mostly sold through dealers.
What happens in a power outage? Water keeps flowing through the resin and still gets softened. The valve just can't start a regeneration until power returns. The Fleck SXT units keep their programming through an outage. Check the time of day afterward, because a wrong clock pushes regeneration into your morning showers.
Will a metered softener save salt if my hardness setting is wrong? No. The meter counts gallons accurately, but the valve uses your hardness entry to work out how many gallons the bed can handle. Set the hardness too high and it regenerates early, wasting salt. Set it too low and you get hard water before it regenerates. Test your water and enter the real number, plus an iron allowance if you're on a well.
Can I upgrade my old timer softener to metered? Sometimes. Some valve families offer metered controllers that fit the same valve body. Whether that's worth it depends on the age of your resin and tank. If the resin is past 10 years old, a complete new system usually makes more sense.
Who should skip a metered softener
- Cabins used a few weekends a year. A metered unit is still better than a timer here, but think about how the resin sits between visits. A days-override setting helps.
- Homes with no reliable power. Every pick on this list needs an outlet. Look at water-powered designs instead.
- Anyone hoping a meter fixes an undersized tank. It won't. If your softener regenerates every day, you need more resin, not a better meter. See how often a softener should regenerate.