Control Valve Types: On-Demand vs Time Clock

What a control valve does

The control valve is the part of a water softener that routes water through the resin tank during normal operation and switches the flow for the regeneration cycle. Penn State Extension describes a softener as an ion exchange unit with two cycles: service, where water passes through the resin, and regeneration, where a salt solution is flushed through to restore the resin. The valve is what moves the unit from one cycle to the other.

When you read a listing, the valve type is usually named in the title or the first bullet. The words "metered," "on-demand," and "time clock" all describe how the valve decides when to start regeneration. A listing that uses none of these words may still show a control head or a digital display, but the regeneration type is not stated by the seller.

Metered and on-demand as listing words

A metered valve counts the gallons of water the household uses and starts regeneration after that set amount. Listings say "metered," "on-demand," or "demand-initiated" for this type. Penn State calls these demand-control models and notes that they are convenient when the water use schedule fluctuates. The metered versus timed comparison is the most common question listing readers ask.

The listing may name the gallon setting, or it may name only the valve type. When a gallon figure appears, it is the seller's stated setting for that model, not a recommendation for your home. The maker's page describes how the gallon count is set and how the valve resets after a cycle.

• "Metered," "on-demand," or "demand-initiated": the valve counts gallons
• "Timer," "time clock," or "time-initiated": the valve follows a schedule
• "Manual": you start the cycle by hand
• No valve word: the seller did not state the control type

Timer and time clock as listing words

A timed valve starts regeneration on a schedule you set, usually a day and an hour. Listings say "timer," "time clock," or "time-initiated" for this type. Penn State calls these timed models and says they work well for households on regular water-using cycles, because the schedule stays the same from week to week. A timed softener regenerates as part of the regeneration cycle that the maker's manual describes.

A time clock valve regenerates at the set hour even if the home used little water that day. The listing may say "digital timer" or "24-hour clock"; the word "clock" or "timer" is the clue that the valve follows a schedule. The maker's page describes how the day and hour are set.

Manual control as a listing word

A manual valve starts regeneration only when you start it. The listing may say "manual" or "manual control." There is no gallon counter and no timer; you turn a dial or press a button to begin the cycle. Penn State notes that some softeners have a manual switch for regeneration.

Manual control is common on portable and RV softeners, where the operator runs the unit by hand. In a whole-house listing, "manual" means the regeneration is started by hand rather than by a meter or a timer. Read the maker's manual for how the cycle is started; the manual versus automatic control article covers the difference.

How the valve type schedules regeneration

The practical difference is when the cycle runs. A metered valve runs after the gallon count is reached, so a week with little water use means the cycle waits. A timed valve runs at the set hour and day. A manual valve runs when you start it. After the cycle, each type returns to service automatically or by the same control.

The listing usually does not describe how often a model regenerates. The regeneration schedule, the salt amount, and the gallon settings are stated on the maker's page and in the maker's manual. If you are setting a new system, the regeneration frequency article explains how the schedule is set on the controls.

Salt use and the regeneration schedule

The valve type changes when the cycle runs. The salt amount per regeneration is a maker's figure, stated on the maker's page or in the manual for the model. A metered valve runs when the gallon count is reached, so the number of cycles in a week follows the water used. The salt per cycle is the maker's stated amount, not a figure this site assigns; the regeneration duration and salt dosage are listed by the maker.

If the listing names a salt figure or a gallon setting, that figure is the seller's statement for that model. The maker's page is where the salt amount, the regeneration frequency, and the valve settings are described. This site does not state those figures because it has no measurement data for them.

Which valve type fits which household

A household with steady water use from week to week may be fine with a timed valve, because the schedule matches the routine. A household with fluctuating use, such as guests, a growing family, or seasonal occupancy, may prefer a metered valve that follows the gallon count; the metered softener guide lists models that name the valve type. A household that wants full control may prefer a manual valve, though that means starting the cycle yourself.

These are shopping preferences, not performance claims. The listing states the valve type; the maker's page states how the valve is set. If you are comparing two models, the valve word in the title is the quickest way to tell them apart, and the buying guides compare models by the valve type named in the title.

Reading the maker's page next to the listing

The maker's page usually has a regeneration section that describes the valve type, the controls, and how the schedule is set. Some makers describe their softener lines as mechanical or digital; the digital versus analog control valve article explains how those words appear on listings. DuraWater, for example, lists "Mechanical & Digital" as its softener categories; the page for each model states what the valve does.

For a home on a private well, read the EPA's private wells and drinking water pages (linked in the sources) before you settle on a softener. The EPA pages describe how well owners check their water; this article does not summarize them.

What to pick for your situation

Questions

What does metered mean on a water softener listing?

It means the valve counts the gallons the home uses and starts regeneration after the set amount. The listing may also say on-demand or demand-initiated.

What does time clock mean on a listing?

It means the valve starts regeneration on a schedule you set, usually a day and an hour. The listing may also say timer or time-initiated.

Which valve type is better, metered or timed?

Neither is better for every home. A metered valve follows water use; a timed valve follows a schedule. Compare the listing's words and read the maker's page for how the cycle is set.

How is a manual valve started?

You start the cycle yourself, usually by turning a dial or pressing a button. The maker's manual describes the steps.

Does the valve type change salt use?

The valve type decides when the cycle starts. The salt amount per regeneration is stated by the maker on the maker's page or in the manual, and that is the figure to read.

Where is the valve type stated?

Usually in the listing title or the first bullet. If the title does not name it, the maker's page or manual states the control type.