Restore Proper Water Distribution Inside Your DE Filter

Inside every DE filter is a critical internal component responsible for evenly distributing filtered water back into the pool system. The Swimables SW-26-400 FNS® Style DE Filter Manifold is a precision replacement part designed to restore proper internal flow within compatible Pentair FNS-style DE pool filters.

When a filter manifold becomes cracked, warped, or clogged, the entire filtration system suffers. Uneven flow can cause broken grids, DE blow-back into the pool, rising filter pressure, and reduced water clarity. Replacing the manifold restores balanced water distribution across all filter grids and helps bring the filter back to peak performance.

This is a pool-specific DE filter internal component, not a generic plumbing fitting.

What a DE Filter Manifold Does

The filter manifold sits at the top of the DE filter grid assembly and serves as the main water collection and distribution point. After water passes through the DE-coated grids, the manifold gathers the clean water and routes it out of the filter tank.

A properly functioning DE filter manifold:

• Distributes water evenly across all grids

• Prevents internal bypassing

• Maintains stable operating pressure

• Protects grids from uneven stress

• Supports clear, consistent filtration

Because the manifold is constantly under pressure and exposed to chemicals, it is considered a wear item over the life of the filter.

Manifold service is often performed during full grid inspections using parts from the Pool & Spa Filters Collection.

FNS® Style Compatibility

The Swimables SW-26-400 is manufactured as an FNS-style DE filter manifold, designed to match the shape, port alignment, and connection points used in Pentair FNS-style DE filters.

Compatibility highlights include:

• Pentair FNS® style DE filters

• Proper alignment with standard FNS grid assemblies

• OEM-style outlet and structural design

• Direct-fit replacement without modification

This component is designed for style compatibility, matching the physical configuration of the original FNS manifold.

Common Signs a DE Filter Manifold Needs Replacement

A failing filter manifold often causes symptoms that are mistaken for grid or valve problems. Replace the manifold if you notice:

• DE powder returning to the pool

• Cracked or broken manifold arms

• Uneven grid wear or broken grids

• Rising or unstable filter pressure

• Reduced filtration performance

Because the manifold supports the grid assembly structurally, damage can cascade into more expensive repairs if ignored.

Many manifold replacements occur during full internal rebuilds using parts from the DE Filter Parts Collection.

Why Manifold Condition Is Critical to Filtration Performance

Even brand-new grids cannot function properly if the manifold is compromised. Cracks or warping allow water to bypass the grids entirely, carrying DE back into the pool.

A properly functioning manifold:

• Ensures all water passes through DE-coated grids

• Prevents internal bypass leaks

• Maintains uniform pressure across the grid pack

• Extends grid life

• Keeps DE inside the filter where it belongs

Replacing the manifold is often the missing step when filters continue to perform poorly after grid replacement alone.

Built for DE Filter Operating Conditions

The Swimables SW-26-400 DE filter manifold is designed specifically for the harsh environment inside a DE filter tank.

Construction features include:

• Chemical-resistant polymer material

• Structural reinforcement for pressure stability

• Precision molding for proper grid alignment

• OEM-style water channeling design

These features help the manifold withstand repeated backwashing, chemical exposure, and pressure cycles.

Installation & Service Considerations

Replacing a DE filter manifold is typically done during grid service or filter teardown.

General Service Overview:

1. Shut down the pump and relieve filter pressure

2. Open the DE filter tank

3. Remove the grid assembly

4. Detach the old manifold

5. Install the SW-26-400 manifold onto the grid assembly

6. Reassemble the filter and recharge with DE

Because the manifold is central to the grid assembly, care should be taken to ensure proper seating and alignment.

During reassembly, related sealing components from the Pool Equipment Collection should be inspected.

Ideal Applications

The Swimables SW-26-400 FNS® Style DE Filter Manifold is ideal for:

• Pentair FNS-style DE filter rebuilds

• Correcting DE blow-back into the pool

• Restoring uneven filtration performance

• Preventative replacement during grid service

• Professional filter refurbishments

This part is commonly replaced proactively during major filter service to prevent future failures.

Supports Long-Term Filter Reliability

Replacing a worn or damaged manifold helps protect the entire DE filtration system.

Benefits include:

• Reduced grid damage

• Improved water clarity

• More stable filter pressure

• Longer service intervals

• Lower long-term maintenance costs

For complete filtration health, internal components should be evaluated together using items from the Pool Filter Accessories Collection.

Why Choose Swimables Replacement Filter Components

Swimables replacement parts are engineered to match OEM-style specifications while offering a reliable alternative for pool professionals and homeowners.

Key advantages include:

• Accurate FNS-style fit

• Durable pool-grade materials

• Trusted compatibility with standard DE grids

• Cost-effective replacement option

The SW-26-400 manifold is a proven solution for restoring proper internal flow and filtration performance.

Buy with Confidence from Benchmark Pool Supply

At Benchmark Pool Supply, we stock pool-specific internal filter components that solve real service issues—not generic substitutes. The Swimables SW-26-400 FNS® Style DE Filter Manifold is selected for proper fit, durability, and dependable filtration performance.

When you purchase from Benchmark Pool Supply, you receive:

• Professional-grade pool filter parts

• Clear compatibility guidance

• Fast shipping or convenient local pickup

• Support from knowledgeable pool professionals

We help keep your filtration system running clean, efficient, and reliable.