Water dispensing device for dispensing water having consistent taste

AA water dispensing device (1) for providing output water in a constant TDS (Total dissolved solids) range, the device comprising:

• a. a feed water inlet (2);
• b. a reverse osmosis unit (4) positioned downstream and in fluid communication with the inlet (2);
• the reverse osmosis unit (4) having a treated water line (14) and a reject water line (5);
• wherein, the reject water line (5) is split by a multichannel connector (3) into, a drain line (5A) for draining the reject water and a first recycle line (5B) adapted to allow reject water from the treatment unit (4), to flow into the line upstream of the reverse osmosis unit (4), the first recycle line comprising a second drain line (5B′D) downstream of the multichannel connector (3);
• and a second recycle line (5C) emanating from the reject water line (5) for flow of water from the reject water line (5) into the line upstream of the reverse osmosis unit (4), the second recycle line (5C) having a third drain line (5C′D) emanating from the second recycle line (5C) downstream of the multichannel connector (3);
• and
• wherein, either a multi-way valve (15) is positioned at the multichannel connector (3) or one valve respectively corresponding for every split line, a drain line valve (9) on the drain line (5A) and a first recycle line valve (10) on the first recycle line (5B) downstream of the multichannel connector (3);
• and
• c. a TDS sensor (7) on the treated water line (14) adapted to measure TDS of the water flowing out of the reverse osmosis unit (4);
• d. an outlet for dispensing water (11);
• and
• e. a control circuit configured to:
• i. store at least two threshold TDS values XA and XB, wherein XA is a higher TDS value than XB;
• and
• ii. configured to choose from the options selected from the group:
• a. water from the reject line (5) only flows through the drain line (5A) when sensed TDS is higher than XA;
• or
• b. water from the reject line (5) flows through the first recycle line (5B) and a second drain line (5B′D) when sensed TDS is less than XB;
• or
• c. when water from the reject line (5) flows through the second recycle line (5C) and the third drain line (5C′D) when sensed TDS is higher than XB and less than XA;
• when the device is in operation;
• wherein, the first recycle line (5B) has a first flow restrictor (5B′FR) positioned downstream of the multichannel connector (3);
• and
• wherein the second recycle line (5C) has a second flow restrictor (5C′FR) positioned downstream of the multichannel connector (3), for flow of water from the reject line (5) into the line upstream of the reverse osmosis unit (4), the flow of water through the second recycle line being operably controlled either by the multi-way valve (15) or a second recycle line valve (13);
• and wherein the second flow restrictor (5C′FR) allows at least 5% lower flow rate of water than the first flow restrictor (5B′FR).