Input liquid flow rate
Conversion result
Pay attention to the distinction between the US gallon (US gal = 3.785 L) and the imperial gallon. (UK gal = 4.546 L)
Input pressure value
Conversion result
The working pressure of the liquid filter bag is usually ≤ 10 bar（145 psi）。Initial pressure difference recommendation ≤ 0.5 bar，If the pressure exceeds 2-3 bar, the filter bag needs to be replaced.
Calculate the filtration flux
Conversion result
Filter flux = Flow rate ÷ Effective filtration area. Typical flux of polyester/polypropylene filter bags：1,000–5,000 L/(m²·h)，Beyond this range, the pressure difference increases rapidly and the lifespan shortens.
Pressure difference health assessment
Assessment result
The pressure difference is influenced by viscosity, temperature and precision grade. For high-viscosity liquids (>50 cP) or fine filtration (lower 5 μm), the initial pressure difference is already relatively high. Therefore, it is necessary to consider the working conditions to determine whether a replacement is required.
This free online calculator is designed for engineers, procurement managers, and plant operators working with liquid bag filtration systems. Convert flow rates across 10 units — including m³/h, GPM (US), IGPM (UK), L/min, and BBL/h — and pressure across 10 units including bar, psi, kPa, mmH₂O, and atm. Use the Filter Flux calculator to verify bag loading for standard #1, #2, #3, and #4 filter bag sizes. The Pressure Drop tool helps you determine when a PE, PP, Nylon, or PTFE bag needs replacement based on current differential pressure and operating conditions.
The ideal micron rating depends on the size of particles you need to remove. Standard liquid filter bags are available from 1 to 1000 microns. Among them, a **200 micron filter mesh** is commonly used for coarse filtration and pre-filtration in industrial water treatment, chemical processing, paint manufacturing, and wastewater applications. Finer cartridge filters are typically selected for applications requiring higher particle removal efficiency.
Bag filters are typically used for high-flow applications and removing larger particles, while cartridge filters are designed for finer filtration and higher removal efficiency. A bag filter is often the preferred choice for bulk solids removal, whereas cartridge filters are commonly used in water treatment, food processing, pharmaceuticals, and semiconductor applications where precise filtration is required.
Key considerations include filtration accuracy, flow rate, pressure drop, operating cost, and maintenance frequency. Cartridge filters generally provide finer filtration but may require more frequent replacement in high-solid-load applications. Our selection tool helps identify the most cost-effective option based on your process conditions.
Common filter bag materials include polyester, polypropylene, nylon, and PTFE. Cartridge filters are available in melt blown, pleated, string wound, and membrane configurations. Material selection depends on chemical compatibility, operating temperature, and filtration requirements.
By entering your application details, flow rate, contaminant type, and filtration requirements, the tool can recommend suitable bag filters or cartridge filters. It is particularly useful when replacing existing filter elements or comparing products from different suppliers.
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