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I am a bit confused as to why the water will be chlorinated. Usually borehole development involves pumping out from the borehole with the water in the aquifer. Or are chemicals being added to develop the borehole in flow etc.?

If you are adding chlorine to achieve this it is feasible to dechlorinate. This does not have to be done by chemical dosing to a flow but can be by putting flow through a chamber with bags of sodium sulphite etc as Martin suggests.

For reuse for agriculture I would suggest de-chlorination and to reduce the suspended solids load through settlement .