WSP Control Valve, Fleck 3900

This control valve is the key component that manages the backwash and regeneration cycles in a water softener or filter system. Built on the reliable Fleck 3900 platform, it keeps your water treatment running smoothly and on schedule.

The problem with your softener’s timing

If your water softener or filter isn’t flushing and recharging properly, you might notice sticky scale building up, cloudy water, or your system’s performance slipping. The timing of those cleaning cycles is controlled by a device called a control valve. When it’s worn out or malfunctioning, your system can’t keep working as it should.

Why your system isn’t cycling right

Inside your water softener or filter, the control valve directs water through different stages: filtering, backwashing, and regeneration. It opens and closes valves to flush out the minerals or sediment that build up. When this control valve wears out, it can get stuck or mistime these cycles. The Fleck 3900 platform uses a mechanical and digital timer combination that coordinates these steps reliably, so a replacement with this valve restores that proper sequence.

What it costs you to leave it

Without the control valve working correctly, your softener or filter can’t clean itself fully. Hard water scale will build up faster, making your water feel hard again. You’ll use more soap to get the same cleaning results, and your appliances that use water will face extra wear and tear. Over time, you’ll spend more time scrubbing fixtures and may need to replace parts sooner than expected.

How this valve keeps your water softener or filter on track

The valve controls the system’s cleaning by opening and closing internal passages in a precise order and at the right times. It uses the Fleck 3900 timer platform, which counts down and initiates backwash and regeneration cycles automatically. This keeps the system flushing out trapped minerals and sediments regularly, so your treatment media stays effective and your water quality stays consistent.

What this control valve handles

This valve fits many standard water softeners and filters using the Fleck 3900 platform. It manages the full range of cycle timing and valve switching needed for backwashing and regeneration. It’s built for continuous, reliable operation in residential and light commercial settings. The valve handles typical household water flow rates and is designed to run your system’s cleaning cycles without extra attention for long periods.

What you actually get

The product includes the Fleck 3900 control valve head with the built-in timer and mechanical components that fit directly onto compatible softener or filter tanks. It does not come with a bypass valve, discharge hose, or tank warranty. The exact setup is confirmed when your valve is matched to your system’s size and type.

Is this the right size for you?

This valve suits softeners and filters that use the Fleck 3900 control platform, typically medium-size residential systems or small commercial units. If your system uses a different valve model or you have very high water usage, you may need a larger or different control valve. We can help you confirm which valve fits your equipment.

Living with this valve

Once installed by your local licensed plumber, this valve needs only routine system maintenance, like refilling salt or replacing filter media. The control valve itself is built to last, but if you notice irregular system cycling or leaking, it can be serviced or replaced without replacing the entire softener or filter. Maintenance effort and cost are moderate and typical for water treatment systems.

What this valve won’t do

This control valve manages the timing and switching of cycles only. It does not filter water by itself, remove contaminants, or soften water without the rest of the softener or filter system. If you need new filtration media, salt, or a full softener replacement, this valve is just one part of the system to consider.

Why buy this Fleck 3900 valve from Water Softener Plus

We’re water treatment specialists based in the US with years of experience sizing and supplying parts that last. This valve uses serviceable components and has parts available years out, so you’re not stuck replacing the whole system. We ship from Tampa with free U.S. shipping included. You’ll get free installation and service manuals, plus expert sizing help by phone if you need it. We offer a 90-day money-back guarantee for peace of mind.

Specifications

The next step

Order your WSP Control Valve, Fleck 3900 online today and keep your water softener or filter running properly. If you’re unsure about size or compatibility, call us for free expert help before you buy.