How to Select the Right UPVC Filter Housing for Industrial Filtration

Choosing the correct UPVC filter housing is one of the most important decisions when designing or upgrading an industrial or commercial water filtration system. Whether you are working on RO pretreatment, industrial water purification, chemical liquid filtration, seawater desalination, or wastewater treatment, the right filter housing ensures stable operation, safe chemical compatibility, and long service life.

This guide will help you decide whether you need a cartridge-type, bag-type, or high-flow UPVC filter housing, and how to evaluate flow rate, pressure, temperature, and installation requirements.

1. Understanding UPVC Filter Housings

UPVC (Unplasticized Polyvinyl Chloride) is widely used in corrosive and industrial environments because it is:

Highly resistant to acids and alkalis

Cost-effective

Lightweight and easy to install

Suitable for many industrial liquids and chemicals

Non-corrosive compared to metal housings

This makes UPVC liquid filter housings a popular choice for RO systems, desalination plants, industrial process water, and chemical solutions.

2. Step 1 — Select the Right Type of UPVC Filter Housing

Different industries and systems require different filtration structures. Your choice depends on the filtration precision, flow rate, liquid properties, and project size.

(A) Cartridge-Type UPVC Filter Housing (3 / 5 / 8 / 9 Cartridges)

Best for:

RO pretreatment

Industrial pure water systems

Cooling water filtration

Chemical liquids

General industrial filtration

Fine filtration from 1–100 microns

Features:

Multi-cartridge design (3 / 5 / 8 / 9 core options)

Compatible with melt-blown, string wound, pleated, nylon, and glass fiber cartridges

Provides stable filtration efficiency

Ideal for small to medium flow rates

This type is suitable when you need precise filtration or when your system requires higher filtration accuracy to protect downstream equipment.

(B) Bag-Type UPVC Filter Housing (#1 / #2 Single Bag)

Best for:

High-flow, low-pressure filtration

Industrial wastewater

Agriculture and aquaculture

Cooling water systems

Pre-filtration before cartridges

Features:

Large dirt-holding capacity

Very easy to maintain

Suitable for particle removal and coarse filtration

Lower cost and simple structure

When your filtration goal is particle reduction or high TSS removal, bag filter housings are the best choice.

(C) High-Flow UPVC Filter Housing (20" / 40" / 60", Vertical or Horizontal)

Best for:

Seawater desalination pretreatment

Municipal and industrial water

Large central filtration systems

High-volume RO systems

Continuous 24/7 industrial operations

Features:

Uses high-flow pleated or melt-blown cartridges

Handles significantly larger flow compared to standard cartridges

Vertical design: easier residue removal

Horizontal design: saves installation height

This option is ideal for customers requiring higher flow, lower pressure drop, and fast cartridge replacement.

3. Step 2 — Choose the Right Filtration Precision

Your filtration accuracy depends on the filter element you choose. Common micron ratings include:

1–5 μm → RO/UF pretreatment

5–25 μm → Cooling water, industrial water

25–200 μm → Wastewater and pre-filtration

1–10 μm → Chemical liquid filtration

Compatible filter cartridges include:

Polypropylene melt-blown

String wound

Pleated cartridges

Nylon melt-blown

Glass fiber cartridges

High-flow pleated filters

UPVC housings are compatible with most standard filter elements, making them versatile for many industries.

4. Step 3 — Determine the Correct Housing Size and Flow Rate

Cartridge-Type Flow Guide

3-core → Small flow systems

5-core → Medium flow

8 & 9-core → Large flow and RO/UF equipment

Bag-Type Flow Guide

#1 bag → Small/medium flow

#2 bag → Larger industrial flows

High-Flow Guide (20", 40", 60")

20" → Small industrial or commercial systems

40" → Standard industrial applications

60" → Municipal systems, desalination plants, high-volume industrial units

Selecting the right size prevents pressure loss and ensures stable system performance.

5. Step 4 — Check Pressure Rating

UPVC housings usually operate within 6–10 bar, depending on size and installation.

Important considerations:

Higher pressure → consider FRP or stainless steel instead

Avoid pressure surges or water hammer

Always check pump pressure before final selection

Choosing a housing with suitable pressure rating prevents damage and leakage.

6. Step 5 — Evaluate Chemical Compatibility

UPVC filter housings have excellent chemical resistance and are suitable for:

Acids

Alkalis

Saline water

Most industrial chemicals

Not recommended for:

Strong organic solvents

High-temperature chemical liquids

If your project involves high temperature or aggressive chemicals, consider PPH filter housing or FRP housings.

7. Step 6 — Consider Operating Temperature

Typical UPVC temperature limits:

0–45°C for stable long-term use

Higher temperatures reduce pressure resistance

Not suitable for hot water systems

Always match temperature and pressure together to ensure safety.

8. Step 7 — Select the Right Connection Type

UPVC housings can be customized with:

Thread connection

Flange connection

Socket connection

Vent valve port

Pressure gauge port

Drain port

Choose based on installation space, maintenance needs, and pipeline layout.
For example:

Vertical high-flow → easier cartridge removal

Horizontal high-flow → ideal for low ceilings or skid-mounted systems

9. UPVC vs FRP vs Stainless Steel vs PPH (Comparison)

UPVC is the best option for cost-effective, corrosion-resistant industrial water filtration.

10. Common Mistakes When Choosing a UPVC Filter Housing

Avoid the following errors:

Selecting a housing that is too small for the required flow

Ignoring the working temperature

Choosing the wrong filter element type

Using UPVC for high-pressure applications

Not checking O-ring compatibility (EPDM, Viton)

A proper assessment ensures safety, performance, and long service life.

Conclusion: Choose the Right UPVC Filter Housing for Reliable Industrial Filtration

Selecting the correct UPVC filter housing depends on your system’s flow rate, filtration accuracy, liquid type, and installation environment. Whether you need a cartridge filter housing, bag filter housing, or high-flow filter housing, UPVC provides a reliable and cost-effective solution for industrial and commercial applications.

For engineered system design, custom sizes, or technical selection support, feel free to reach out—we can provide complete selection guides, flow charts, and model recommendations tailored to your project.