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NP Drumfilters

The NP Drumfilter is a mechanical, self-cleaning microscreen filter designed for high performance in water-treatment systems where it is essential to minimize particle break-up.


The NP Drumfilter is ideal for use in aquaculture applications as well as industrial and municipal water and waste-water treatment. The filter design ensures careful handling of solids to achieve the best filtration effect.

The improvements cover both the design and manufacturing stages, enhancing filtration performance whilst lowering the investment, as well as operating and maintenance costs.

To ensure the highest standards of quality all design work and manufacturing takes place in Sweden.

Download our filter brochure.

Drum filter or disc filter?

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Why is it better?

The development work leading up to the new NP Drumfilter covers the basic design principles, as well as many detail refinements. For example:

  • Drum design with support shaft and slide centre bearings at each end – improved structural integrity, reduced over-all weight and long-life bearings help reduce investment and operational costs.

  • Increased drum length-to-diameter ratio – provides an increase in peak solids loading capacity.

  • Drumfilters from model size 1212 and upwards are by default equipped with oscillating backwash spray header (”Moving Backwash”). This function improves the cleaning and life span of the filter cloth and reduces backwash water consumption by 20%. (A)

  • Peripheral drive arrangement with lubricant-free non-metallic chain reduce stress on the drum structure and drive arrangement, leading to reduced maintenance costs. (B)

  • Choice of modular filter panel designs: PG panel with polypropylene grid and the PL panel with 8% larger open filter area. Comparison tests show quicker lifting-out of particles and less lifting-out of water. (C)

  • Single GRP access cover with stainless steel gas struts and safety switch – enhanced safety and access in service and maintenance. (D)

  • Modular design – increases manufacturing efficiency leading to reduced initial purchase cost and improved delivery periods.

  • Emergency bypass – protects the drumfilter from overloading.

Model Range

1. Stainless steel tank version

2. Drumfilter with FRP tank (Fiberglass Reinforced Plastic)

3. Freestanding stainless steel tank version

4. Stainless steel frame version

Size Range

2000 mm diameter: Sizes: 5, 6, 7, 8, 9 and 10 sections

1600 mm diameter: Sizes: 4, 5, 6, 7, 8, 9 and 10 sections

1200 mm diameter: Sizes: 1, 2, 3, 4, 5, 6, 7 and 8 sections

  800 mm diameter: Sizes: 1, 2, 3 and 4 sections

  600 mm diameter: Sizes: 1 section only

  500 mm diameter: Sizes: 1 section only

Drumfilter models
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