invention in order to remove the hardness of water for recycling fig1 well water 100 is pumped p into a cooler 102 and aerated which results in precipitation of ferrous ferric oxide the percentage of fe remaining in water after this step is very low 1 39 the water is then passed through a sand filter 104 to remove suspended solids and the purified water from the sand filter is passed to a precipitation chamber 110 for treatment with lime ca oh 2 106 soda na 2 co 3 108 and sodium aluminate na 4 al 2 o 5 107 at a ratio of about 27 70 3 of the respective components to remove hardness and silicates this chemical treatment process results in the precipitation of ca and mg salts such as caco 3 mg oh 2 mgco 3 and a complex of sodium aluminum silicate by chemical reactions since the solubility constant of these salts is very low they precipitate and settle in the bottom of the precipitation chamber 110 as solid waste which are removed at 111 those of skill in the art recognize that the softened water exiting chamber 110 can be forwarded to a reverse osmosis system 115 to further purify the water which is subsequently stored in a fresh drinking water tank 120 this solid waste material a mixture of ca and mg salts and complex of sodium aluminum silicate from the precipitation chamber is collected as a paste dried in an oven at 60 75 u00b0 c to remove moisture and ground into particulate having high surface area the ground precipitates are then used as adsorbent for the removal of heavy metal ions such as cu cr and pb from industrial wastewater to obtain clean water for the development of landscape.