Biolan Oy

- Model 70 - Greywater Filter

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A purifier of all water used for washing, capacity about 500 litres a day,  to be installed above ground, domestic, ecological filter material, can be used even in winter.

Installing the filter    
Place the filter on a firm and even surface that is not susceptible to frost, such as, for example, a bed of gravel or crushed stone or a cast concrete slab. The filter must be in a horizontal position both lengthwise and laterally to allow the wastewater flow smoothly and take advantage of the entire cleaning surface area of the filter material.
   
Connecting the inlet and outlet sewer pipes
While installing gravity flow sewers, a sufficient gradient (of at least 1-1,5 %) needs to be provided to allow the wastewater to flow without obstruction from the sewer outlet of the house all the way to the discharge point.

There are inlet and outlet connectors for 75 mm sewer pipes on both sides of the modules. The inlet connectors are located at the upper edge and the outlet connectors at the lower edge of the modules. The inlet connectors of the modules are joined together using connecting pipes and a branch sleeve. The sewer pipe coming from the building is connected to the branch sleeve that joins the modules together. By means of the branch sleeve, the wastewater flow is distributed evenly to both modules. The even distribution can be ensured by installing a straight part 80 cm long in the inlet pipe before the branch sleeve to reduce turbulation of the incoming water flow.

The outlet connectors for purified water are located at the lower edge of the filter, on both sides of the modules. The purified wastewater can be conducted to the discharge point either separately from each module or by joining together the outlet connections of the modules using an intermediate pipe (not included in the delivery) and conducting the water out through the outlet connector of one of the modules. The outlet connectors of the modules can also be joined together using similar branch sleeve that was used in the inlet pipe. The the discharge point for the purified wasterwater can then be located between the modules. The excess inlet and outlet connectors shall be closed using the plugs included in the delivery.

If the purifier is to be used in winter, the inlet sewer must be insulated. Whether the outlet sewer needs to be insulated shall be considered case by case.
 
Putting the filter material in place
The filter material has been placed ready on the trays inside the unit. For transportation it is packed in plastic bags. Remove the plastic bags.

  1. Rip the filter material loose and spread it evenly across the box by tapping it gently. Depending on the packing method applied there may be excess filter material in the bag. The amount of filter material in the box is sufficient when its surface lies about 2 cm below the edge of the box.
  2. Finally, draw the filter material about 5 cm to the rear from the V-openings in the discharge end of the box.
  3. The filter material boxes are identical, but observe their direction – in the uppermost box water flows towards the rear wall, in the next box it flows towards the service door etc. The lowermost box takes the water towards the rear wall, from where it falls along the formed bottom into the discharge sewer.

Opening the air valves
The operation of the filter is based on the activity of the micro-organisms. The micro-organisms need oxygen to survive. Therefore, the air exchange in the filter must be taken care of. There are two adjustable disk valves for ventilation in the rear wall of the modules. Set both disk valves of the module about 10–20 mm ajar for the summer. In winter keep the valves only slightly ajar (about 5–10 mm).

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