Owner’s Manual
Page 2/12
20210721
Disinfection filter (FDi)
Item # 339919
1.
Operating Principle
Figure 1 – Overview of Ecoflo biofilter and passive disinfection filter (FDi)
The passive disinfection filter (FDi) is designed to reduce the concentration of pathogenic organisms at the Ecoflo biofilter’s effluent for
sites where it is impossible to infiltrate wastewater through an absorption bed or polishing field. The passive disinfection filter (FDi) is
made up of a waterproof membrane which contains a wastewater distribution system, a filtering sand bed with an aeration device, a
treated wastewater collection system and a pumping station allowing for both the recirculation of the water at the disinfection filter’s
inlet and the sampling of the treated effluent.
At the Ecoflo biofilter’s outlet, the water is directed towards the passive disinfection filter (FDi) to attain a “tertiary treatment level with
disinfection” (Class V). The passive disinfection filter (FDi) is equipped with an inlet zone that feeds the sand filter vertically. This inlet
zone consists of a layer of clean crushed stone resting on a filtering sand layer. For Ecoflo biofilters equipped with an integrated pump,
the effluent is distributed over the inlet zone through a pump and a low-pressure distribution system. For watertight bottom Ecoflo
biofilters without an integrated pump, the effluent is distributed over the inlet zone through the PSA-240L pumping station and a low-
pressure distribution system. As for Ecoflo biofilters with an opened or perforated bottom, the water percolates within the biofilter
before it reaches the FDi’s inlet zone (located directly at the base of the biofilter) by gravity. Those feeding systems allow for optimal
distribution over the entire surface of the FDi’s inlet zone. After having vertically percolated through the sand layer, the water flows
slowly along the FDi’s entire length to finally be directed towards the final disposal mode through a collection pipe.
The FDi’s operating principle allows for the continuous or intermittent use of the system without requiring any particular precaution or
having any impact on the quality of the treatment. No specific action from the owner is required to start the system, he must however,
comply with the operating guidelines described in this manual.
The FDi’s dimensions as well as the model and number of Ecoflo biofilters (consult the Annex 1) are determined either according to the
number of bedrooms in a house or to the total daily domestic water flow of any building.
Septic tank with
effluent filter
Ecoflo biofilter
Passive disinfection filter
