Robust Bulk Filtration with #2 Size, 25 Micron Polyester Felt Liquid Filter Bags

When your process involves significant loads of fine‑to‑medium particulates—such as sediment, rust, polymer fines, or biological debris—a coarse‑grade filter is your first line of defense. Our #2 Size 25 Micron Liquid Filter Bags, crafted from high‑loft polyester felt with a polypropylene “F” flange ring, deliver dependable depth‑filtration in standard 4″ × 10″ or 4″ × 20″ housings. Whether you’re clarifying process water, protecting UV lamps, or safeguarding heat exchangers from fouling, these filter bags provide the durability, flow capacity, and chemical compatibility you need.

This guide follows a clear structure—market overview, product fundamentals, key features, selection guidance, maintenance best practices, reasons to choose our bags, illustrative use cases, and actionable next steps—to help you deploy 25 µm filtration effectively and confidently.

Market Overview: The Value of 25 Micron Pre‑Filtration

1. Protecting Downstream Equipment

Particles larger than 25 µm can erode pump seals, scratch membranes, and clog fine nozzles. Capturing these particulates prolongs the life of sensitive downstream components and reduces maintenance costs.

2. Improving Process Consistency

In applications from industrial rinses to beverage production, removing bulk sediments and haze improves consistency, reduces downtime, and ensures repeatable product quality.

3. High‑Flow, Low‑Head‑Loss Requirements

Operations handling tens to hundreds of gallons per minute demand filters that won’t starve pumps. High‑micron felt bags provide large open channels for high throughput at minimal pressure drop.

4. Inventory Simplification

Standardizing on 25 µm as a primary pre‑filter size reduces SKU complexity and ensures rapid change‑outs during unplanned solids surges.

5. Versatile Applications

From pulp & paper whitewater to horticultural recirculation systems, 25 µm polyester felt bags adapt to a wide pH range and temperatures up to 180 °F, making them a go‑to choice for bulk‑solids removal.

Product Fundamentals: What Makes Up a #2 Size 25 Micron Felt Bag

• Media: High‑loft polyester felt engineered to nominally retain ~85–95% of particles ≥25 µm, offering robust dirt‑holding capacity without rapid clogging.

• Bag Size: “Size 2” refers to a nominal 4″ internal diameter and choice of 10″ or 20″ length, fitting all standard Size 2 housings (single, dual, or multi‑bag systems).

• Seal Ring: Polypropylene “F” flange collar molded for a precise, leak‑free seal on housing ledges in aqueous, mildly acidic, or alkaline fluids.

• Construction: Ultrasonic or heat‑welded seams eliminate stitch‑hole bypass, supporting up to 75 psi differential pressure for long service life.

Key Features of Our 25 Micron Polyester Felt Bags

1. Coarse‑Particle Retention

• Nominal 25 µm Rating: Efficiently removes silt, scale, algae, and other visible particulates to protect downstream media and equipment.

2. Robust Polyester Felt Media

• High‑Loft Design: Depth‑filtration matrix traps particles throughout the felt thickness, maximizing dirt capacity.

• Chemical & Temperature Resistance: Stable to 180 °F and resistant to most aqueous streams, mild acids, and alkalis.

3. Polypropylene “F” Flange Ring

• Secure, Bypass‑Free Seal: Rigid flange locks into housing ledge, ensuring all fluid flows through the media.

• Broad Compatibility: pH 2–12 inertness preserves seal integrity and prevents contamination.

4. Seamless Weld Construction

• Zero Bypass: Ultrasonic or heat seals bond layers seamlessly, preventing stitch‑hole leakage and fiber migration.

• Structural Integrity: Seam supports full differential pressures without delamination.

5. Flexible Size & Length

• 10″ & 20″ Variants: Select the length that matches your flow rates and housing depths—shorter for compact systems, longer for extended runtimes.

• Multi‑Bag Housing Compatibility: Perfect for single‑bag or multi‑bag vessels to scale capacity.

6. Low Initial Pressure Drop

• Optimized Fiber Loft: Balances coarse retention with minimal initial ΔP, preserving pump efficiency and stable operation.

Selecting the Right Configuration

A. Match Micron Rating to Solids Profile

• Heavy Sediment Streams: Use 25 µm bags to trap grit and sand before finer polishing stages.

• Combined Pre‑Filtration: Pair 25 µm pre‑filters upstream of 5–10 µm bags to maximize downstream cartridge life.

B. Determine Flow & Housing Requirements

• Flow Capacity: 10″ Size 2 bags handle ~10–15 GPM; 20″ bags handle ~20–30 GPM per bag. For higher flows, use multi‑bag housings.

• Pressure Constraints: Ensure your pumps can sustain the required backpressure; bags are rated to 75 psi differential.

C. Validate Chemistry & Temperature

• Process Fluids: Confirm compatibility of polyester felt and polypropylene ring with fluid pH and temperature.

• Sanitary Needs: For food & beverage, select FDA‑grade felt and follow certified manufacturing protocols.

D. Choose Disposable vs. Reusable

• Disposable Mode: Single‑use bags simplify change‑outs and avoid cleaning validation.

• Reusable Mode: If acceptable, rinse or back‑flush non‑hazardous debris; inspect media integrity prior to reuse.

E. Ensure Proper Sealing & Support

• Gasket Matching: Verify housing seals (O‑rings, gaskets) align with F‑flange profile.

• Support Cages: In multi‑bag vessels, confirm internal cages fit and support bags under flow.

Maintenance Best Practices

1. Monitor Differential Pressure

• Install Gauges: Track ΔP across housings; replace bags when ΔP reaches 15–20 psi.

2. Bag Changeout Protocol

• Safe Handling: Use gloves and changeout tools to avoid contact with used media.

• Interior Cleaning: Wipe down housings between changes to remove settled debris.

3. Disposal & Cleaning

• Non‑Hazardous Solids: Dispose per standard industrial waste guidelines.

• Hazardous Streams: Follow local regulations for contaminated media disposal.

4. Seal & Housing Care

• Inspect Gaskets: Replace worn seals to prevent bypass.

• Clean Support Cages: Remove accumulated solids to ensure even flow distribution.

5. Documentation & Optimization

• Service Logs: Record installation dates, ΔP at removal, and volume filtered to refine change schedules.

• Performance Checks: Periodically sample effluent for turbidity to confirm retention efficiency.

Why Choose Our 25 Micron Felt Bags?

• Balanced Retention: Nominal 25 µm rating effectively protects downstream assets while sustaining high flow.

• Durable Media: High‑loft polyester felt resists tearing and chemical attack.

• Reliable Seal: Polypropylene F‑flange ring ensures bypass‑free operation.

• Seamless Construction: Welded seams prevent fiber migration and leakage.

• Flexible Sizing: 10″ and 20″ lengths fit all Size 2 housings.

• Rigorous QC: Batch‑tested for retention, flow, and dimensional accuracy.

Illustrative Use Cases

1. Industrial Rinse Water: A metal shop uses 25 µm bags to remove welding spatter and metal fines before UV treatment, extending lamp life and reducing cleaning frequency.

2. Brewery Pre‑Polish: A craft brewery filters wort through 25 µm bags to trap hop particles and trub before finer polishing, improving clarity and yeast performance.

3. Cooling Tower Makeup: An HVAC plant installs 25 µm pre‑filters ahead of chemical feed to trap sand and biological debris, reducing fouling and chemical consumption.

4. Pulp & Paper Whitewater: A paper mill uses 25 µm bags to remove fiber bundles and fillers from whitewater, protecting downstream screens and pumps.

Summary and Next Steps

The #2 Size 25 Micron Polyester Felt Liquid Filter Bags, Polypropylene Ring offer a high‑capacity, durable solution for bulk sediment removal and pre‑filtration in Size 2 housings. Their coarse‑micron depth‑filtration, robust sealing, and seamless construction deliver reliable protection for downstream processes and equipment.

Next Steps:

1. Assess Solids Profile: Determine particle sizes and volumes in your process stream.

2. Select Bag Length: Choose 10″ or 20″ based on flow rates and housing depth.

3. Install ΔP Monitoring: Equip housings with gauges to optimize change‑out intervals.

4. Train Personnel: Establish standardized change‑out and housing maintenance procedures.

5. Measure ROI: Track equipment uptime, filter life, and maintenance costs to validate performance improvements.

Incorporate these premium 25 µm felt filter bags into your filtration strategy to ensure clear, contaminant‑free fluids, extended equipment life, and streamlined operations.

Liquid Filter Bag

Pre：Enhance Your Filtration System with #2 Size, 10 Micron Polyester Felt Liquid Filter Bags

Next：Streamline Bulk Solids Removal with #2 Size, 50 Micron Polyester Felt Liquid Filter Bags