A major new & most ...

A major new & most effective/cost efficient LONG-TERM treatment process, is to have raw water pass through a "charcoal" bedding. How that's set up, will depend on how the bore-hole is laid out. Charcoal - in & of itself - can filter out/deal with both sediment & pathogen infections. Sediment, however, can eventually clog natural pores of the charcoal face, & thereby ultimately reduce its effectiveness/contribution to purification. So, by simply dding a few  drops of Aluminum Sulfate [Al2SO4)3], it causes sediment to drop to the bottom; for ease of periodic purging/removal, for other value-added use*. PLUS: Coating charcoal - in a Colloidal Silver "paint" form - can both prevent the clogging of charcoal pores (thus gaining much, much longer "effective use-life"), but also adding a truly MORE POTENT PATHOGEN-CONTROL WAY: TO BOTH INITIALLY PURIFY + then LEAVE AN EVEN MORE DURABLE/LONG-TERM COUNTER "ALL-PATHOGENIC FORM" SAFETY FACTOR IN POTABLE WATER! (E.g., even as it sits out in open ewers/other NON-purified vessels, awaiting final consumption/use!) {Special Note: *That water treatment sediment can serve as a valuable crop plant growing "mulch", as it helps in both nutrition & hydration of seeds/seedling cultivation! E.g., "more bang for the buck($)"!}