Our Filtration Technique is Unique

The WISY 4-STEP Rainwater Harvesting System ensures that your rainwater will not only become clean but also stay so during the storage period. By relying on an almost vertical filter mesh, the WISY filter is self-cleaning and automatically removes dirt and debris, resulting in a minimal system maintenance.

WISY 4-STEP Rainwater System

Only Four Easy Steps To Keep Your Rainwater:

  • STEP 1: Pre-Tank Filtration
  • STEP 2: Smoothed Inflow & Distribution
  • STEP 3: Floating Suction Filter
  • STEP 4: Multisiphon Overflow

Unique Filtration Technique

What is so special?

  • Vertical stainless steel filter mesh
  • First Flush & Self-cleaning device
  • Maintains cross-sectional diameter of rainwater downpipe
  • Utilization of natural forces of water
  • Applied for more than 28 years in over half a million filter

WISY 4-STEP HARVESTING SYSTEM

The WISY 4-step rainwater harvesting system ensures that your rainwater is clean enough to store.

By using the 4-step system you will:
  • reduce the amount of particulates that enters the rainwater tank & as a result prolong the life of your pump filtration equipment
  • oxygenate the water to inhibit growth of anaerobic bacteria
  • create a higher & better water quality for your system
  • ensure a calmed inflow & distribution of the water without re-suspending sediments
  • prevent formation of a surface barrier layer and therefore ensure optimum exchange of oxygen between air and water
  • extract clear rainwater from the cleanest water layer
  • eliminate the need to clean debris from your tank
  • minimize system maintenance due to unique pre-filtration technique

HOW DOES IT WORK?

STEP 1 : PRE-TANK FILTRATION

During the first step of the filtration process up to 90 % of rainwater is filtered and diverted to the rainwater tank. The remaining 10 % are used to ensure the self-cleaning effect of the filter. WISY filters operate as a first flush device, directing leaves, dirt and debris to drainage or On-Site Detention tank (OSD). Therefore, large particulates are removed. Due to the oxygenation of the water during the filtration process, the amount of harmful bacteria in the rainwater tank is greatly reduced.

Diversion & Filtration 95 % Efficiency First Flush Self-Cleaning Oxygenation


STEP 2 : SMOOTHED INFLOW & DISTRIBUTION

While filtration removes most of the sediments, a small quantity will settle at the bottom of the tank. This biofilm layer is beneficial for the tank since it removes additional bacteria and metals from the water. The smoothing inlet is designed to direct incoming water upwards. This prevents rainwater from stirring up the healthy biofilm layer and also ensures the distribution of oxygen-rich water throughout the tank.

Calmed Inflow Maintain Healthy Biofilm Layer Even Oxygen Distribution


STEP 3 : FLOATING SUCTION FILTER

The floating suction filter ensures the intake of the cleanest water from just below the water surface.

Extract water from cleanest layer


STEP 4: MULTISIPHON OVERFLOW

By skimming floating particulates on the surface of the water the multisiphon prevents the formation of a surface barrier layer & ensures an optimum exchange of oxygen between air and water.

Skimming-Effect Ensure Oxygen Exchange Backflow Prevention Vermin guard

UNIQUE FILTRATION TECHNIQUE

We have been designing and manufacturing low-maintenance filters with stainless-steel mesh since 1989. These filters are in use all over the world - both in production processes and modern rainwater harvesting systems.

Note: All three videos show the operation when water enters the filter simultaneously from different angles. This example displays a WFF150 Vortex Fine Filter.

HOW DOES IT WORK?

When water falls through a vertical tube, it tends to cling to the inner surface of the tube. This behavior is caused by adhesion forces which can be exploited to alter the direction of water flow. Solids do not behave in this way, they just fall straight down. Furthermore, they are captured by the fine stainless-steel mesh of the filter. Only clean water can pass into the storage tank or back to the production process.


ALWAYS SAFE

The cross-sectional area of the connected tubing does not change at any point inside the filter housing so that larger debris particles can pass straight through. Even a tennis ball washed off the roof cannot block the rainwater pipe.

Wisy Filtration Principle

Leaves and particles cannot clog the filter