Information regarding reuse of RO waste water for Rain Water Harvesting

Hi!

Please can someone tell me if we can direct the RO waster water to the rain water harvest pit?

I am currently constructing my house and it has 3 kitchens each with a RO filter installed, as we dont have drinking water supply yet. I was thinking  of directing the RO waste water from each kitchen into the rain water pit. Please can someone tell if this is safe to do?

Thanks

Aditya

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