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Rainwater PREFILTERS

Self-Cleaning Prefilter

  • Prefiltering will remove solid particles that contain the bacteria and also feed the bacteria.

  • The prefilter also aerates and oxygenates the water reducing bacteria.

  • Aeration can help oxidize dissolved metals like iron, which then precipitate and can be removed.

How does a self-cleaning prefilter work?

First, the prefilter provides a first flush action. The initial rainfall, which is full of contaminants, is rinsed off the roof pass the filter mesh, flowing to the dirty water or storm discharge. As rainwater passes by the stainless steel vertical mesh, the mesh itself is coated in water. Once the mesh is completely coated with water, it begins to pull rainwater through the inner fine mesh to the outer coarser mesh through adhesion or surface tension. The water is directed to the rainwater tank. This process agitates the water and provides aeration. The downspout filter will filter out particles greater than 320 microns (0.32mm or 0.013”). The centralized filter will filter out particles greater than 280 microns (0.28 mm or 0.011”).


How often do I have to clean the vertical stainless steel mesh?

The mesh is constructed with stainless steel and never has to be replaced. Due to the vertical design of the mesh, they are virtually self cleaning. Hard rainfall will completely clean the mesh. General maintenance is required 2-4 times a year, and is achieved simply by removing the filter and rinsing it clean with water.

Downspout Prefilter

With a downspout prefilter rainwater system, each downspout harvesting rainwater requires a prefilter. The prefilter is installed above ground, but will supply water to either a above ground tank or below ground tank.

Rainwater harvesting system downspout prefilter component cutaway view. Collect the cleanest possible rainwater with a rainwater harvesting prefilter. A cutaway of the downspout rainwater prefilter component with descriptions of the various parts and how it filters rainwater. Rainwater harvesting system downspout prefilter component profile view. High quality, clean rainwater before entering rainwater storage tank. Three profile views of the downspout rainwater prefilter component.

What happens if the prefilter backs up?

The prefilter should never backup, as the system water can leave through two discharge points: the filtered water outlet to the tank; or the dirty water discharge to grade, storm system, or other adequate location. Based on this design, the filter has a larger pipe volume leaving than entering the filter. This filter can act as a secondary overflow point.

Centralized Pre-Filter

With a centerialzied rainwater system multiple rainwater downspouts all feed the same prefilter. The prefilter can be installed above ground or below ground.

Rainwater harvesting system centralized prefilter component profile view. Collect the cleanest rainwater from a whole home or commercial building with a centralized rainwater harvesting prefilter. Two profile views of the centralized rainwater prefilter component. Rainwater harvesting system centralized prefilter component cutaway view. Clean and high quality rainwater is produced by this centralized rainwater harvesting perfilter. A cutaway of the centralized rainwater prefilter component with descriptions of the various parts and how it filters rainwater.

Rainwater Prefilters