Under sink reverse osmosis system belongs to a kind of home water purifiers which contains micro-filtration, carbon adsorption, reverse osmosis filtration to reach an overall tap water filtration effects. Inside of a under sink reverse osmosis system, the core working part is the reverse osmosis membrane filter. Water filtered by reverse osmosis membrane can be used as drinking water directly.
Under Sink Reverse Osmosis System Working Principle
Normally, tap water can not flow through reverse osmosis membrane. Tap water has a high density while the ro membrane has a 0.0001 micron ratings tiny aperture. To make sure the under sink reverse osmosis system works well, manufacturer equips a pressure pump to help water molecules pass the reverse osmosis membrane. That’s why the under sink reverse osmosis system requires power source for operation which is a must-have to let pump works.
Generally speaking, water dilutes from low concentration to high concentration. As for under sink reverse osmosis systems, the pump adds enough pressure to let water dilutes and flows from high concentration to low concentration. That’s why people call it under sink REVERSE OSMOSIS SYSTEMS.
Flow Rate, Waste Water Ratio
Flow rate of under sink reverse osmosis system calculated by reverse osmosis membrane specifications. Popular reverse osmosis membrane filters have 400, 600, 800 and 1000 Gallon filtration capacity. The numbers of Gallon divided by 24 hours and then divided by 60 minutes is the actual outflow water amount each minute. The real water flow rate of 400, 600, 800 and 1000 Gallons reverse osmosis membranes would be 0.28, 0.42, 0.56 and 0.69 Gallon Per Minute which equals to 1.06, 1.59, 2.11 and 2.61 Liters Per Minute.
Another important parameter of under sink reverse osmosis system is waste water ratio which refers to the use ratio of raw water. The reason why waste water ratio exists is because that under sink reverse osmosis system generates a certain amount of waste water during filtration process which is undrinkable and needs to be drained out through waste water pipe. A waste water ratio of 2 : 1 means 1 gallon of waste water generated while filters 2 gallons of clean drinking water. At present, most under sink reverse osmosis systems on market covers a waste water ratio range of 2 : 1, 3 : 1, 4 : 1 and even 5 : 1. The higher the ratio is, the less money cost each day.
Tank or Tankless Works Better?
Among most home use water purifier and filtration system, the “tank or tankless” choice only suits reverse osmosis water filter system. And then it brings the same choice to under sink reverse osmosis system, either. Tankless under sink reverse osmosis system is becoming more and more popular due to limited under counter space, operation noise and cost performance.
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