What is the reason for low TDS in RO Purified Water ?Reverse Osmosis ( R.O.)Water Purifiers are being used widely now a days in India and rest of worlds also for drinking water . The main reason of using the Reverse Osmosis (RO) water purifiers is to get most safe drinking water .
As all of us aware that the water we get for drinking now a days in towns or cities are coming from either municipal tap water or bore water from underground source .
And if you are getting water from tap , the pipes may be very old rusted, dusted & with full of corrosion.
And the Bore well water may also be of with all industrial and pesticide pollution material going underground because water with effluent and detergent with other harmful chemical are being drained in public place or canals or in rivers without any treatment .
Therefore to remove physical, chemical and microbiological impurities from your source water it is necessary to use most reliable filter to remove these harmful impurities from the water so that it can be drinkable.
Reverse Osmosis ( R.O.) system works on the principle of Reversing The Osmotic Pressure with the help of membrane , so it is very fine purification that even ionic load is also filtered and in domestic type of RO water purification only 10 % of raw water salts or Total Dissolved Solids (TDS) remain in pure water by default in general and 90% of salt contents flush out .
So this is the reason of being low TDS in RO purified water though it generally happens if you are putting in such a raw water in RO which is already low in TDS like River water or tap water
How to increase TDS without a TDS controller?
To increase TDs in RO water now a days TDS control valve is being fitted and this is the mechanism where some pre treated water added in final treated water and then passed via UV for final disinfection but in this system whole reliability of clean water depends on continuously workability of UV system
So other method is call remineralisation means if we fit one mineral cartridge or alkaline filter in post filtration of any RO system then we can increase the TDS in final treated water weven without fitting the TDS control valve , so this method is more preferable and even UV can be fitted here in end stage for more reliability of water quality .