If you use a spring for your water supply, it is a good idea to use a
sand prefilter to take out mud, maybe crawdads, pollywogs,
killer-whales. If there is risk of giardia or coliform bacteria,
install a separate valve plenum and commercial activated-carbon
cartridges in your drinking water faucet. Here is a schematic of the
pipes and valves for a three-tank sand filter.