RH9521-12 Vortex Filter
Operation and Maintenance
Overview
The RH9521-12 Vortex Filter harvests up to 95% of the
rooftop rainwater runoff from a roof area up to 33,000 sq.
ft. Particulate is separated and diverted from the rainwater
through the vortex action to protect the harvested water
quality prior to entering the storage tank (cistern). The
Vortex Filter is used primarily for below ground installations
where multiple downspouts are connected to a single trunk
line. The RH9521-12 can be used for above ground
applications and can be mounted with a custom-made
stand or bracket, supplied by others. The trunk line feeds into the centrally located Vortex Filter.
• Particles larger than 380 microns are diverted into the storm drain.
• The full cross-section of the rainwater drainage system remains continuously open in the
RH9521-12 system. There are no restrictions or obstructions in the filter on which debris can
collect.
• The filter element develops it’s maximum efficiency when the filter mesh has been completely
wetted. After a dry period, this can take up to 2 minutes. This first flush action diverts the entire
initial flow of water into the storm drain. After the filter is completely saturated, filtered water will
be delivered to the cistern.
• If necessary, (for deeper underground installation) an extension can be installed up to ground
level (accessory).
• The rainwater inlet can be turned 360° in relation to the lower section. The central drain outlet is
vertical so that pipes can be connected in any direction.
Installation
Pre-planning is critical. It is recommended that the filter be in place before trunk lines are run and the
tank is buried for below ground applications and prior to constructing a platform for above ground
applications.
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