Ultra Filtration Membrane and SS Housing

Ultrafiltration Membrane and Stainless Steel Housing – 2025 Model

UF membrane and stainless steel tank only – add your own Fleck or Clack backwashing control valve.

This is the same PVDF hollow-fiber membrane and stainless steel housing used in our 5900-BT Ultrafiltration System, sold without a control valve. It is a good fit if you already own a compatible backwashing valve, are replacing a worn tank and membrane, or prefer to use a valve you already know.

The PVDF hollow-fiber membrane, rated at approximately 0.015 micron, captures fine suspended particles and colloidal clay that can pass through conventional sediment filters, at service flow rates of up to 10 gallons per minute.

Control Valve Compatibility

The housing has a standard 2.5-inch tank thread opening and uses a 1.05-inch distributor tube – the same distributor size used with the Fleck 5600. It fits standard Fleck and Clack control valves that mount on a 2.5-inch tank thread and accept a 1.05-inch distributor tube.

• Control valve not included. You supply the valve, bypass, and plumbing connections.
• Use a backwashing filter valve. The valve must be set up to backwash the membrane on a schedule.
• Minimum backwash flow: 7 GPM. Your water supply must deliver at least 7 gallons per minute during backwashing, with upstream filters in place.
• Drain required. A drain connection with an air gap is needed for backwashing.

Not sure your valve will work? Send us the make and model and we will confirm before you order. Prefer a complete, pre-matched system? See our 5900-BT Ultrafiltration System, which includes the control valve.

Why Ultrafiltration Works Well for Colloidal Clay

Colloidal clay consists of extremely fine particles that can remain suspended in water and create persistent cloudiness. Some of these particles are small enough to pass through spin-down strainers, backwashing sediment filters, and standard sediment cartridges. Ultrafiltration adds a much finer physical barrier, which makes it useful when conventional sediment filtration improves the water but does not eliminate the remaining haze.

• Reduces turbidity: Removes fine suspended material responsible for cloudy water.
• Captures fine colloidal clay: Addresses particles that conventional sediment filters can miss.
• Approximately 0.015-micron membrane rating: Provides exceptionally fine particulate filtration.
• Retains dissolved minerals: Allows dissolved hardness minerals and salts to pass through.
• No continuous reject-water stream: Water is discharged during backwash cycles.

Recommended Pre-Filtration

We recommend a dual-grade 25/1-micron Big Blue sediment pre-filter ahead of the UF membrane. A spin-down or backwashing sediment filter can also reduce the load reaching the membrane. Iron, manganese, and other water problems may require separate treatment.

Have heavy clay after rain? Contact us before ordering so we can review the severity of the problem, your existing filtration, and available flow.

Specifications

Ultrafiltration Membrane and SS Housing – 2025 Model

Specification	Details
Included	Stainless steel housing and PVDF UF membrane cartridge
Control valve	Not included
Tank opening	Standard 2.5-inch tank thread
Distributor tube	1.05-inch (same as Fleck 5600)
Compatible valves	Standard Fleck and Clack backwashing valves for 2.5-inch tank thread and 1.05-inch distributor
Membrane material	PVDF hollow fiber
Membrane rating	Approximately 0.015 micron
Service flow	Up to 10 GPM; actual flow depends on water quality and operating conditions
Minimum backwash flow	7 GPM
Housing diameter	Approximately 11.8 inches
Maximum water temperature	100°F
Installation orientation	Vertical only
Recommended pre-filtration	Dual-grade 25/1-micron Big Blue sediment filter

Install indoors or in a protected outdoor location and protect from freezing.

Membrane Material Safety Testing

The membrane has undergone SGS material extraction testing in accordance with NSF/ANSI 58 extraction requirements. This testing evaluates substances that may leach from materials in contact with drinking water. It does not establish colloidal clay removal performance or certify the membrane as a microbiological purifier.

Frequently Asked Questions

Will my existing control valve work?

If it is a backwashing filter valve that mounts on a standard 2.5-inch tank thread and takes a 1.05-inch distributor tube, it should fit. Most standard Fleck and Clack valves meet this. Send us your valve make and model if you want us to confirm.

Is this the same membrane as the 5900-BT system?

Yes. It is the same membrane and stainless steel housing, sold without the 5900-BT control valve.

Will it remove tannins, hardness, or dissolved iron?

UF is a particulate filter. It does not soften water or reliably remove dissolved tannins, dissolved iron or manganese, salts, or dissolved chemicals.

Does it remove bacteria and viruses?

This membrane is not certified as a microbiological purifier. Do not rely on it alone to make contaminated water safe. Confirmed bacterial contamination requires appropriate disinfection, such as properly designed UV or chlorination treatment.

Is backwashing the only maintenance required?

Regular backwashing helps remove accumulated particles, but the membrane may also need periodic cleaning or replacement. Maintain the pre-filter and adjust the backwash schedule to match your water conditions.

Get Help

Our technical team can review your water test, existing filters, well flow, and control valve to confirm this is the right fit.

Call 888-600-5426 or contact our technical team.