How to Select the Right String Wound Filter Cartridge?

Why the Right Choice Matters?

Picking the wrong String Wound Filter Cartridge often costs far more than the part itself - premature clogging, media degradation, fluid bypass, and frequent change-outs drive up labour and downtime. With so many options (materials, cores, sizes), how do you decide? This filter cartridge selection guide covers four key factors to help you match the right depth filter cartridge to your process.

Step 1 - Define Your Operating Conditions

Always start with your fluid environment. Different conditions demand different designs:

Step 2 - Pick the Right Filter Material

Material determines chemical compatibility, temperature limit, and safety. Here are the three mainstream choices for industrial String Wound Filter Cartridges:

● Bleached Cotton (Best for Food & Beverage) - Superior air permeability, no raw liquid contamination. Ideal for drinking water, beverages, wine, and dairy products.

● Glass Fiber (Best for Harsh Conditions) - Outstanding high-temperature and strong corrosion resistance. Ideal for high-temperature chemicals, fine chemicals, and specialty fluids.

● PP Polypropylene (Best for General Use) - Excellent acid/alkali resistance, cost-effective, stable performance. Ideal for pure water, tap water, and general industrial circulating water.

Step 3 - Select the Support Core Structure

The inner core provides mechanical strength. Overlooking it can cause collapse under pressure.

● PP Inner Core - Cost-effective, sufficient for stable, low-pressure systems. Features integrally molded high-toughness polypropylene.

● Stainless Steel Core (SUS304 / SUS316) - Essential for high-temperature and high-pressure applications. SUS316 offers superior acid/alkali resistance and a much longer service life than PP cores.

Step 4 - Confirm Size Specifications

Ensure proper fit with your existing housing.

● Outer Diameter Options: 63/65mm (Standard) - Matches most 10/20/40-inch filters. 114mm (Large Diameter) - Provides higher flow and larger dirt-holding area for main pipeline and high-flow systems.

● Standard Lengths: 10 inch, 20 inch, 30 inch, 40 inch - Fit most general industrial housings. 50 inch, 70 inch- For large-scale water treatment projects (Hongtek uses one-piece integrated cores for better rigidity - no splicing gaps).

Quick Selection Summary - Match Your Application

There is no one-size-fits-all wound filter cartridge. The right selection balances material, core, size, and precision against your real working conditions. A proper match ensures stable filtration, protects downstream equipment, and significantly reduces your annual maintenance budget.