We design a conceptual solution of water utilization and an adjustment of grey waters with a backward usage. We judge aprofitability of grey water prufication and a relevant backward usage of clear waters for the given object.

Grey waters, their purification and backward usage are the most utilize to decrease the consumption of drinking water mostly in objects as administration buildings, wellness cetres and aquaparks, hotels, hospitals, schools, sport areas etc. The adjustment of grey waters is used to decrease the consumption of drinking water and by this supports the environment protection and to decrease the costs of the water consumption. The adjustment of grey waters  must be provided so that it cannot endanger the health of people. Above all it is suitable to use grey water for toilet flushing, floor washing, irrigation in these objects.