Installation And Assembly Of The 400 External Substrate Filter; Preparing The Trench; Inserting The Stainless Steel Plate; Filling And Inserting The Filter Bags - Graf Extern 400 Notice D'installation Et D'utilisation

5.

Installation and assembly of the 400 external substrate filter

5.1

Preparing the trench

To ensure that sufficient working space is available and that the filter can be evenly back filled, the base
area of the trench must exceed the filter dimensions by 500 mm on all sides. The embankment should be
built in accordance with DIN 4124. The foundation must be horizontal and even. The trench must be
sufficiently deep that the installation depth down to the filter bed does not exceed 5000 mm. The
substructure is made from a layer of compacted round gravel (grain size 8/16 mm in accordance with DIN
4226-1, approx. 100 mm thick).
Important: The surface for the shaft must be completely level in order to ensure optimal function.
5.2

Inserting the stainless steel plate

We would recommend first inserting the substrate filter's housing in the trench. The stainless steel plate is
placed in the substrate filter housing from above. Ensure that it is fitted horizontally on the inner profile of
the substrate filter housing.
5.3

Filling and inserting the filter bags

The best way to fill the filter bags with the substrate is to use an ordinary dustpan. Make sure that all
three filter bags contain approximately the same amount of substrate. This means an approximate weight
of 3.5 kg per bag.
The first filter bag is placed on the stainless steel supporting plate in the filter. The other filter bags are
placed on top of one another.
5.4

Fitting inlet module

The inlet module is slid into the filter housing from above. Before sliding in, the profile seal is inserted in
the sealing groove of the substrate filter housing. The inlet module and seal must have a generous
amount of the soft soap supplied rubbed into them (do not use mineral oil-based lubricants).
Please note: If the soft soap dries, the inlet module can only move with great difficulty and there is a risk
that the seal will slip out of the groove.
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VS inlet module 400
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Housing for substrate filter 400
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Profile seal
10 / 24
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