Regeneration of a man made lake
and a drinking well

The Lake

Condition in June 1997

Algae coats the water like a veil and swimming is hardly possible. The visual depth is approximately 15cm at this time. Due to the density of the trees surrounding the lake, the layer of sediments has become thicker from year to year which creates more problems in the water.





Condition in June 1999

The lake is clear, no visible algae, the visual depth is approximately 1,5m. The sediment layer is reduced by 80%, according to the owner. The water smells excellent and swimming is a pleasure.

Mr. Hillen became aware of the Plocher system through an article in the press about the Wachtendonker Nature Swimming Bath. He decided to use the system on his 27 year old, 5000m² large man made lake. In the last few years the problems have become worse, particularly in summer as the algae has become more. The reason being that the sediment on the bottom of the lake is becoming continuously thicker.

Every 14 days, Mr. Hillen administered penac-w 4041 surface water by rowboat.

In the winter months, from November to March, penac-w 4541 waste water was used to achieve a quicker mineralization of the mud and sediment layer.

During the two-year treatment a discoloration of the water occurred several times which proves the increase in bacteria activity in the water. This transformation of the sediments was noticeable on the water surface. This was pointed out to the owner of the lake at the beginning of the treatment and he was quite happy with that.

The entire regeneration process takes about three years, however, already after two years it has been successful and this is clearly visible. The third year of treatment is needed for stabilization of the ecology which is absolutely necessary to ensure a stable condition of the water for the years to come. The need for this three-year treatment was from the start planned and accepted. The family is very satisfied with the condition of the water which is solely used for private purposes. Due to the density of the trees around the lake, continuous treatment with the Plocher system is imperative. The quantity needed will be approximately 6-8kg per year.

Treatment of the well

Another problem the Hillens experienced was that the water in the well was infested with coliforme bacteria, E-coli and increased nitrate levels (65mg/l). Fecal impurity was the cause according to the Institute of Food Technology and Environmental Hygiene. The institute recommended a chlorine treatment but shortly after that the old problems were back. Gerd Willems, the Plocher consultant, suggested that the water in the well comes from the lake, which is approximately 30m away. It appeared logical that the water from the lake would seep towards the well as they were relatively on the same level. About six months after commencement of the lake treatment in 1998 the well treatment began parallel to the lake treatment. A water catalyst, penac-kat and penac-w 4341 ground water were used. On a weekly basis the well, which is 6m deep, received 30g penac-w 4341 ground water. The penac-kat was installed on the suction pipe of the piston pump.

At the end of 1998 the following water analysis results were determined by above institutes:

Coliforme bacteria – negative, E-coli – negative, nitrate – 35,2mg/l

With the help of the Plocher system the drinking water was regenerated and now offers the best healthy, good tasting drinking water.

The mud sediment in the lake was successfully reduced which was the cause of the problems. The dosing of the well has now been reduced to 30g/month. We now have beautiful clear water in the lake and consequently the drinking water in the well is also absolutely clear, healthy and good tasting.

The above case is a very good example of how by respecting and working with nature Plocher has implemented "natural cycles" and followed nature’s flows.