Filtration is a complicated topic. The proper way to design filtration begins with assessing the potential risks to the water, be it from collection surfaces, surrounding land use activities, or other air shed related hazards. Design begins with this risk and hazard analysis, sometimes some pre-testing of roof run-off water, and always verified against water testing after the system is installed.
A prime example of of this would be a remote cabin on the westcoast, with a clear air shed and limited pollen, located near a river. Pristine in all aspects. Except during the salmon run, when the roof becomes a seagull perch.
Filtration is designed to address such items as Total Dissolved Solids (TDS), Total Suspended Solids (TSS), Turbidity (NTU), pH, organics, particulates, and chemistry.
Disinfection is designed to protect from cysts, bacteria, viruses, and protozoa. Disinfection relies on pre-filtration to reduce the items in the water that would impair the disinfection process.
We have experience with cartridge and media filtration, peroxide and chlorine injection, RO and UV systems.
Filtration/disinfection systems for the average house cost between $3000 and $6000 depending on your level of risk.