Brown water from borewell for few mintues & then fresh water - Borewell 400 ft, casing upto 85 ft in Bangalore,Karnataka

Borewell depth is 400 feet, with casing upto 85 feet in Jaynagar, Bangalore. The bore is year old and even now the first two minutes when it is switched the water is brown in colour followed by fresh water. Need help with this problem.

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