The Below Ground Potable system will be harvesting rain from one building. The roof is asphalt.
Gutter, Downpipes and conveyance Piping
The gutters, downpipes, and conveyance piping are sized based on specifications from the designs. When using the rainwater for potable water, the gutter, downpipe, and conveyance piping should be NSF P151 approved or coated with an NSF P151 approved coating.
Prefilter
The system will require two (2) pre-filters. These pre-filters operate as both a first flush diverter and pre-filter, with a filter mesh size of 320 microns. The full cross-section (pipe diameter) of the rainwater drainage system remains continuously open, and there are no reductions in the cross-section of this appliance in which dirt or water can collect.
Rainwater Tank / Cistern
This below ground potable system will provide a total of 6000 US gallons of rainwater storage, with a total of four (4) below-ground tanks made of polyethylene. Each tank is 1500 US gallons. The rainwater tank is designed to provide safe storage of rainwater, which improves water quality because of its design and function. The calming inlet prevents agitation of settled fine dust, the skimming overflow removes floating particles, and the floating filter ensures water is drawn into the pump from approximately 150 mm (6.0″) below the surface of the water.
Water Pumping and Treatment Systems
Cleanflo determined the water demand to be 8 GPM at 60 PSI. This will be pumped by a multi-stage booster pump powered by VFD. The treatment will be three stages to ensure water is safe to use. Stage one is a sediment filter of 15 microns which provides a self-cleaning flush to drain. Stage two is a 10-micron carbon filter. Stage three is a 1-micron sediment filter. Stage four is an ultraviolet sanitation system NSF 55 Class A.
Water Quality and Treatment
Cleanflo designed this system to produce water that is safe for CSA B805 R4 uses, namely potable domestic.
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