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.
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