CLIAMS:1. A water purification device (100) for removal of contaminants, the water purification device (100) comprising:
a first disinfectant adding device (108), wherein the first disinfect adding device (108) is to add a predetermined concentration of first disinfectant in untreated water received from a source vessel (104) to obtain chemically treated water;
a second disinfectant adding device (110) coupled to the first disinfectant device (108), wherein the second disinfectant adding device (110) is to receive the chemically treated water from the first disinfectant adding device (108) to add a predetermined concentration of second disinfectant in the chemically treated water to obtain treated water;
a flow rate controller (116) coupled upstream with respect to the first disinfectant adding device (108) and the second disinfectant adding device (110), wherein the flow rate controller (116) is to control the flow rate of the untreated water to the first disinfectant adding device (108) and the second disinfectant adding device (110) to regulate the predetermined concentration of the first disinfectant and the second disinfectant dissolved in the untreated water, the flow rate controller (116) comprising:
a first chamber (226) having a first opening (202) for ingress of the untreated water from the source vessel (104);
a second chamber (224) separated from the first chamber (226) by a partition (206) and fluidically coupled to the first chamber (226) through a guide tube (210) in the partition (206), wherein the second chamber (224) having a second opening (204) for egress of the untreated water to the first disinfectant adding device (108); and
a regulator (214) to regulate the flow of untreated water from the first chamber (226) to the second chamber (224), wherein the regulator (214) is disposed in the first chamber (226) to plug an entrance of the guide tube (210) and a float (208) is coupled to the regulator (214) by a link (212) extending through the guide tube (210), wherein the float (208) is disposed in the second chamber (224) to regulate plugging of the guide tube (210) based at least on a level of the untreated water in the second chamber (224); and
a feedback mechanism (112) to actuate the regulator (214) of the flow rate controller (116) to control flow rate of the untreated water based on a level of treated water obtained from the second disinfectant adding device (110).

2. The water purification device (100) as claimed in claim 1, wherein the water purification device (100) further comprises:
a collection vessel (106) coupled to the second disinfectant device (110) and to the feedback mechanism (112) to store treated water, wherein the feedback mechanism (112) further comprising:
a feedback float (402) connected to a bellow (218); and
a connecting member (216) to connect the feedback float (402) to the regulator (214), wherein the feedback float (402) is to displace the connecting member (216) based on the level of the treated water in the collection vessel (106) to actuate the regulator (214) of the flow rate controller (116) to control the flow rate of the untreated water.

3. The water purification device (100) as claimed in claim 1, wherein the first disinfectant is one of chlorine and silver.

4. The water purification device (100) as claimed in claim 1, wherein the second disinfectant is one of the chlorine and silver.
5. A method of water purification for removing contaminants, the method comprising:
receiving untreated water from a source vessel (104);
controlling the flow rate of the untreated water to a first disinfectant adding device (108) and a second disinfectant adding device (110) by a flow rate controller (116), for regulating the concentration of a first disinfectant and a second disinfectant, respectively, in the untreated water;
adding the first disinfectant to the untreated water by the first disinfectant device (108) to produce chemically treated water;
adding the second disinfectant to the chemically treated water by the second disinfectant device (110) to produce treated water, the treated eater being collected in a collection vessel (106); and
regulating further the flow rate of the untreated water based on a feedback mechanism (112), wherein the feedback mechanism (112) operates the flow rate controller (116) based on a level of the treated water in the collection vessel (106).
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