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Operation and maintenance manual, Discfilter HSF2200-1/2F PFC
6. FUNCTION
6.1 Intended use
The filter is designed and manufactured to remove solid particles in unpressurised water flow
systems. The filter is not a pressure vessel.
6.2 Non-intended use
Unless approved in writing by Hydrotech, the filter must not be used to filter liquids other than
water. The filter must not be installed in an environment with an explosive atmosphere or
another risk of explosion, such as high concentrations of dust.
6.3 Filtration and backwash process
A brief description of the process is given below.
1. The water to be filtered flows with gravity from the inside of the filter drum out to the filter
segments.
2. Solid particles are separated from the water with the help of filter media attached to both
sides of the filter segments, while the clean water passes through the filter media to the outside
of the filter segments.
3. Operating mode AUTO – The solid particles that accumulate on the inside of the filter media
gradually reduce the water flow through the filter panel. The water level on the inside of the
drum begins to rise. When the water reaches the level sensor, drum rotation and backwash start.
Operating mode HAND – Drum rotation and backwash are started manually.
4. The backwash nozzles spray wash water on the exterior of the filter panels. The solid particles
that accumulate are washed from the filter panels to the sludge channel, at the same time as
the drum rotates.
5. The removed particles and backwash water flow with gravity out of the filter.
Figure 6.1 Function of the discfilter.
