Boll Filter Corporation

Boll & Kirch Filterbau GmbH, operating under the BOLLFILTER brand, is a filtration systems manufacturer headquartered in Kerpen, Germany with more than 75 years of engineering experience. The company holds ISO 9001, ISO 14001, ISO 45001, and ISO 50001 certifications and is recognized by major marine classification societies. BOLLFILTER's automatic backwash filter line spans multiple model families: the aquaBoll platform (Type 6.18.3) covers DN 50 to DN 1000 with filtration grades from 10 microns to 5 millimeters using interchangeable fine sieve cylinders, filter candles, and sieve cylinders; the Type 6.18 welded backwashing filter handles flows up to 10,000 cubic meters per hour with bipolar cylindrical candles; and the Type 6.19 offers external flushing supply for low-pressure applications below 16 bar. Specialty automatic models include the Type 6.04 self-cleaning strainer (10 to 500 microns), the Type 6.21/6.22 fuel oil filter (10 to 48 microns), the Type 6.46/6.48 continuous backflushing lube oil filter, the Type 6.64 maritime self-cleaning filter (6 to 50 microns), and the Type 6.72 standard fuel oil filter. The aquaBoll BWT serves ballast water treatment with bronze and super duplex baskets, and the Type 6.03 AOT uniquely combines backwashable filtration with UV-AOT disinfection in a single DN 40 unit. The company also manufactures duplex and simplex filter housings, fine filter units including tubular plants, flatsheet plants, and reverse osmosis systems, plus plate membranes and tubular membranes. Proprietary technologies include FouleX-coating for automatic filter elements, the DDAT digital differential pressure transmitter, BOLL CLEAN cleaning agent, and Type 5.04 high-pressure and Type 5.05 ultrasonic cleaning systems. Water applications encompass sewage treatment, potable water, desalination, irrigation, ballast water, and HVAC.