Thin red worms in water from well in Basaveshwarnagar, Bangalore, Karnataka - Need advice on cleaning the well

We have recently found there are worms coming from the tap, which red in color and are very tiny which gets stuck to the botton or on sides. We have a well, overhead tank and we have done rainwater harvesting (which filters into the well)

We are not sure from where this worms are coming, we think it should be probably from well.

How do we clean this and what steps we need to take care?

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