K Factor Filter logo — industrial liquid filtration manufacturer
    Resources

    Frequently Asked Questions

    Pick a subject to see its questions and answers. Still stuck? Send us your process parameters.

    What is automatic backwash pressure filtration?

    Automatic backwash pressure filtration is a continuous liquid filtration process in which a pressure vessel containing a permanent filter element self-cleans automatically when differential pressure across the element reaches a pre-set trigger point. The backwash cycle — typically 10 to 30 seconds — reverses flow across the element to flush captured solids to drain without interrupting filtration or process flow.

    What is the difference between a backwash filter and a basket strainer?

    A basket strainer is a manual device requiring a process shutdown to clean. A backwash filter is an automatic device that cleans itself in seconds without interrupting flow. Basket strainers are appropriate for low-contamination, infrequent-cleaning applications. Automatic backwash filters are appropriate for moderate-to-heavy contamination applications where cleaning would otherwise be required weekly or more frequently.

    What is differential pressure in filtration?

    Differential pressure (DP) in filtration is the pressure difference between the inlet and outlet of a filter element. A clean element has a low baseline DP. As solids accumulate and block pores, DP rises. Automatic backwash filters use a DP sensor to trigger the backwash cleaning cycle when DP reaches a pre-set threshold — typically 0.3 to 0.8 bar above the clean baseline.

    What is the K-Optifil automatic backwash filter?

    The K-Optifil is K Factor's flagship automatic backwash filter, developed in partnership with Lenzing Filtration of Austria. It uses a patented partial-backwash rotating arm mechanism that cleans a small section of the filter element at a time, maintaining continuous filtration through the rest of the element. Filtration to 1 micron is achievable. Over 100 K-Optifil systems are installed in automotive E-coat pretreatment lines globally.

    What micron rating do K Factor pressure filters achieve?

    The K-Optifil achieves filtration to 1 micron via filter cake formation, 3 micron with a depth filter fleece, and 5 micron with a metal fabric screen. Standard inline pressure strainers achieve 25 micron to 3,000 micron depending on screen selection. The appropriate micron rating depends on the application — contact K Factor's engineers to confirm the correct specification for your process.

    Can backwash filters handle chemical and acidic process streams?

    Yes. K Factor backwash pressure filters are available in 316L stainless steel, Hastelloy, Duplex stainless, and polypropylene-lined carbon steel to handle acidic, caustic, and chemically aggressive process streams. Seal materials — EPDM, FKM, PTFE, NBR — are selected for the specific fluid chemistry. The K-Optifil is rated to 120°C standard and operates continuously in chemical processing and petrochemical applications.

    What is scrubber blowdown and how is it filtered?

    Scrubber blowdown is the liquid waste stream generated by wet industrial air scrubbers — systems that remove acidic gases, particulate, and VOCs from exhaust stacks in chemical plants, metal finishing facilities, and power generation. The blowdown water contains captured suspended solids that must be removed before treatment or discharge. K Factor automatic backwash pressure filters are installed as the first-stage solids removal step in scrubber blowdown treatment circuits.

    Does K Factor supply pressure filtration for cooling towers?

    Yes. K Factor supplies automatic backwash pressure filters and inline strainer systems for cooling tower makeup water filtration and side-stream filtration of recirculating cooling water. Systems protect heat exchangers, spray nozzles, and tower packing from suspended solids fouling, reduce Legionella risk by limiting biofilm substrate, and operate continuously without manual cleaning shutdowns. Available across the US, Canada, and Gulf region.

    What industries use K Factor pressure filtration systems?

    K Factor pressure filtration systems serve automotive manufacturing, cooling towers and HVAC, oil and gas production, chemical processing, petrochemical refining, mining, heavy industry, pulp and paper, power generation, and municipal water treatment. The K-Optifil is particularly proven in automotive E-coat pretreatment applications with over 100 installations globally through the Lenzing Filtration partnership.

    Does K Factor serve international markets for pressure filtration?

    Yes. K Factor serves the United States, Canada, and the Gulf region (UAE, Saudi Arabia, Qatar, Kuwait, Bahrain, Oman) directly. Through the Lenzing Filtration partnership, K Factor's technology is available in Europe, Asia-Pacific, and Latin America. Contact K Factor at 1-289-362-6108 or sales@kfactorfilter.com to discuss supply and service arrangements for your location.

    What is K Factor's 30-day free trial for pressure filtration?

    K Factor's 30-day free trial makes the K-Optifil or an inline pressure strainer system available in your facility at no cost, with no purchase obligation. We assess your application, deliver the system, and commission it on-site. You run it for 30 days and evaluate performance. If the system does not meet your requirements, return it — no invoice. Available to qualifying facilities in the US, Canada, UAE, and Saudi Arabia.

    What is the payback period for an automatic backwash pressure filter?

    Payback periods depend on the application and incumbent technology being replaced. In cooling tower applications, payback typically occurs within 12–18 months through energy savings from improved heat transfer efficiency and reduced maintenance labour. In automotive pretreatment applications, payback is typically 6–12 months through bag filter elimination and bath life extension. In oil and gas applications, a single avoided heat exchanger cleaning event ($10,000–$50,000) often justifies the investment.