3P Technik Filtersysteme GmbH

Clean water | 3P Filter efficiency

Water is part of a never-ending cycle. Between the seas, clouds, rain, hail, snow and the system of streams and rivers no drop gets lost and no new drop is made.

However, saving fresh and drinking water makes sense from economic and environmental point of view. Water may seem to flow endlessly from our taps, but its delivery and purification requires more and more energy, more effort and so more costs.

Drinking water is our most important food. The average household uses around 128 litres of water a day, but as little as 3% of it is needed for preparation of food and drinks.

For many uses we do not need high quality drinking water. For toilet flushing, washing machines, for cleaning and garden watering you can safely use filtered rainwater, with the help of the right rainwater equipment, properly installed.

This means that half of the drinking water used can be saved without any reduction in hygiene and comfort.

Other benefits of using rainwater:

1. More efficient washing, saving up to 50% on washing powder.
2. Washing machines do not become furred up with lime.
3. No lime scale/salt built up in toilets and urinals.
4. There is no better water for your garden and plant irrigation.

Rainwater system

Correct design and use of the correct components will ensure years of trouble free operation and a quality of the rainwater which will be harmless for the scope of application. It exceeds the quality of swimming lakes required by the lawmaker.

Roof areas

Only the water of roof areas should arrive in the cistern. Smooth surfaces are suited best (schist, glazed concrete roofing file). The income of rainwater from green roofs is between 30 and 50%. It can be slightly brownish sometimes, but can still be used for toilet flushing and garden irrigation.


4 Cleaning Steps


1. Cleaning Step - Filter

The first cleaning step in the rainwater system is the filter. The rainwater flows from the roof to the filter. Here dirt particles and debris are separated from the water. The cleaned water flows to the tank. The dirt is washed to the stormwater pipe or soakaway with a small amount of rainwater. All 3P rainwater filters have stainless steel inserts, which are easy to remove and easy to clean. Their many different working principles and connection possibilities allow for their use in many different installation situations.

2. Cleaning Step - Calmed Inlet

By using an underground tank, the water is stored in dark and cool conditions. Here the second cleaning step takes place. In the water column, any fine residual particles settle to the bottom of the tank. The rainwater Calmed Inlet prevents any disturbance of this sedimentation layer. At the same time the Calmed Inlet ensures that oxygenated water is introduced to the lower layers of the stored water in the tank. This oxygen rich water prevents anaerobic reducing conditions forming in the storage tank and ensures that the water stays fresh.

3. Cleaning Step - Overflow Siphon

Any particles that are lighter than water (e.g. flower pollen) float slowly to the water surface. The expertly designed 3P Overflow Siphon, with a skimmer effect, removes this floating layer. The regular overflow from the storage tank is important to get the optimum water quality. It prevents souring of the water. The floating layer could otherwise build up over time, and so reduce oxygen diffusion at the water surface, which in turn could lead to anaerobic reducing conditions in the tank.

4. Cleaning Step - Floating Pump Intake

The 3P Pump Intake floats at all times, suspended just below the water surface where the cleanest water lies. From this position the water is abstracted by the pump. A ball float, filled with air, suspends the intake, which has a further filter and a check valve.


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