all reused waste water from ...

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all reused waste water from the  factory is to be checked if it is nuetral i.e. having a ph of 7+-1. if not treat it with acid or lime, then remove solid impurities by a ss filter + simple sand & gravel gravity filteration ,then inject it into the ground to be taken out after 30 days which again must be checked to be suitable for your industry. take a 2nd opinion from a geologist.