For anyone to help you you will need to say more about what you are intending to use the water for and what tests you have carried out to determine the water quality.
For reference, I have a rainwater system supplying most of the water in the house and this has 2 strainers on the way into the tank, 2 filters between the tank and the pump, a 25 micron filter and an activated charcoal filter after the pump and finally a UV sterilizer. I also test it once a year for bacterial contamination.
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