Automatic self-cleaning filters, backwashable strainers from BOLL

Automatic filters have a self-cleaning mechanism that periodically flushes out accumulated debris to prevent clogging. Backwashable strainers from BOLLFILTER allow continuous operation and are suitable for systems where manual cleaning is inconvenient. They can be used as connected filters.

Looking for an automatic backwash filter that fits your specific needs?
We have a wide range of automatic filters to choose from, depending on your flow rate, grade of filtration, and type of fluid.

Contact us now!  Our team is always available to help you choose the right filter.

aquaBoll®: Self-cleaning water filter, backwashable strainer with adaptive filter elements »

aquaBoll®: Self-cleaning water filter, backwashable strainer with adaptive filter elements
Flange Connection
DN 50 to DN 500 / 2" to 20"
Filter element
Fine sieve cylinder element, Filter candle element, Sieve cylinder element
Grade of filtration
10 µm - 5 mm

engineBoll: Automatic filter for lube oil and fuel oil filtration »

engineBoll: Automatic filter for lube oil and fuel oil filtration
Flange Connection
DN 50 to DN 300
Filter element
Muliti-Segment
Grade of filtration
1µm - 50µm

aquaBoll BWT: Automatic filter for ballast water »

aquaBoll BWT: Automatic filter for ballast water
Flange Connection
DN 80 - DN 600 / 3" - 24"
Note
Automatic self-cleaning pre-filtration of sea-water, for the protection of ballast water treatment systems
Filter element
special plated basket with mesh made of super duplex

BOLLFILTER Automatic Type 6.03 AOT: The 2-in-1 solution for water filtration, backwashable and with UV disinfection »

BOLLFILTER Automatic Type 6.03 AOT: The 2-in-1 solution for water filtration, backwashable and with UV disinfection
Flange Connection
DN 40 / 1 ½"
Filter element
Slotted and mesh candles
Grade of filtration
Nominal filtration grade: 50 - 100 µm

BOLLFILTER Automatic Type 6.04: Automatic backflushing filter, self-cleaning strainer for water and coolant »

BOLLFILTER Automatic Type 6.04: Automatic backflushing filter, self-cleaning strainer for water and coolant
Flange Connection
FNPT DN 40 / 1 ½"
Filter element
Screw-in candles (stainless steel)
Grade of filtration
10 µm – 500 µm

BOLLFILTER Automatic Type 6.18: Welded backwashing filter, self-cleaning strainer for water »

BOLLFILTER Automatic Type 6.18: Welded backwashing filter, self-cleaning strainer for water
Flange Connection
DN 500 - DN 1000 / 20" - 40"
Filter element
wedge wire, longitudinal wedge wire candle or wire-mesh candle with smooth surface
Grade of filtration
10 µm - 5 mm (depending on the size of the filter)

BOLLFILTER Automatic Type 6.21/6.22: Backflushing filter for fuel oil »

BOLLFILTER Automatic Type 6.21/6.22: Backflushing filter for fuel oil
Flange Connection
DN 50 (optional with Adapter to DN 32 / 1 1/4") / 2"
Filter element
Multi-Segment
Grade of filtration
optional 10 µm, 25 µm, 34 µm or 48 µm

BOLLFILTER Automatic Type 6.48: Efficient continuous backflushing filter for lube oil »

BOLLFILTER Automatic Type 6.48: Efficient continuous backflushing filter for lube oil
Flange Connection
DN 40 - DN 300 / 1 1/2" - 12"
Filter element
wire-mesh candles
Grade of filtration
10 µm to 48 µm

BOLLFILTER Automatic Type 6.64: Self-cleaning filter for the maritime industry »

BOLLFILTER Automatic Type 6.64: Self-cleaning filter for the maritime industry
Flange Connection
DIN Only DN 100 - DN 400 (Approx. 4" - 16")
Filter element
wire-mesh and star pleated candles (made of stainless steel with smooth surface)
Grade of filtration
6 µm - 50 µm

BOLLFILTER Automatic Type 6.64: backflushing filter for coolants »

BOLLFILTER Automatic Type 6.64: backflushing filter for coolants
Flange Connection
DN 100 to DN 400 / 4" to 18"
Filter element
wire-mesh candles (optional made of stainless steel with smooth surface)
Grade of filtration
6 µm - 150 µm

BOLLFILTER Automatic Type 6.72: Standard fuel oil automatic self-cleaning filter »

BOLLFILTER Automatic Type 6.72: Standard fuel oil automatic self-cleaning filter
Flange Connection
DN 40 - DN 80 / 1 ½" - 3"
Filter element
wire-mesh and star pleated candles (made of stainless steel with smooth surface)
Grade of filtration
6 µm - 200 µm

BOLLFILTER Automatic Type 8.64/8.72: Fine filtration for low pressure systems »

BOLLFILTER Automatic Type 8.64/8.72: Fine filtration for low pressure systems
Flange Connection
DN 65 - DN 150 / 2 ½" - 6"
Filter element
screw-in candles with star-pleated stainless-steel wire mesh
Grade of filtration
6 µm absolute, 10 µm absolute

Functionality of the self-cleaning filters

Filtration stage

The medium flows through the filter element either from inside to outside or from outside to inside. Here the dirt particles are retained and the cleaned medium reaches the filter outlet. When the differential pressure reaches a certain value, a signal is transmitted from the differential pressure indicator to the control unit, which automatically triggers the backwashing process.

Backflushing phase

During backflushing, the dirt particles are flushed off of the filtration surface by filtered fluid reversal of flow (own medium or through external flush medium, compressed air or service water).

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