Types Of TDS Levels
TDS or total dissolved solids are the total amounts of mobile charged ions like salts, minerals, cations, metals etc, present in the water. As per the guidelines of WHO the water with a TDS less than 1000 mg/litre are acceptable for consumption. The lesser the TDS level the better the quality of water. The water can become hazardous only when its TDS is more than 500. Thus, for eliminating the impurities you will require a water purifier.
The table below shows the different levels of TDS.
TDS levels in parts per million (ppm) | Palatability quotient |
Between 50-150 | Excellent for consumption |
150-250 | Good |
250-300 | Fair |
300-500 | Poor |
Above 1200 | Unacceptable |
Difference Between RO, UV &UF
RO filter | UV filter | UF filter |
The filter requires electricity for the purification process. | The filter requires electricity for the purification process. | There is no need for electricity for the purification process. |
Capable of filtering all the bacteria and viruses present in the water. | Capable of killing all the bacteria and viruses present in the water but does not eliminate them. | Capable of filtering all the bacteria and viruses present in the water. |
The filter requires high water pressure and needs an additional pump. | The filter can work with normal tap water pressure. | The filter can work with normal tap water pressure. |
Capable of removing dissolved salts and harmful metals. | The filter cannot remove the dissolved salts and harmful metals present in the water. | The filter cannot remove the dissolved salts and harmful metals present in the water. |
The size of the membrane in the filter is 0.0001 micron | No membrane required | The size of the membrane in the filter is 0.001 micron. |
The filter is capable of removing 90% TDS | Cannot remove TDS | Cannot remove TDS |
Factors To Consider Before Buying The Best Water Purifier In India
Storage Capacity
Always look for the storage capacity the water purifier is offering. If you live in an area where there are frequent power cuts, then it becomes more important. Thus, it is recommended to have a water purifier that has got large storage tanks that can be operated with or without electricity. This ensures that there will always be a continuous supply of pure and contamination of free water.
Electricity
It is necessary to choose the purifier as per the power supply in your area. This is because UV and RO purifiers require electricity. If you live in an area with an insufficient power supply of frequent power cuts, then look for alternative water purifiers. Thus, here the need for the power tank comes in. Purchase the purifier that does not work on electricity or helps you cope up with the power cuts.
Water Pressure
In the case of UV and RO filters, the incoming water supply must be at good pressure. The RO filters can’t work properly if the pressure is insufficient. Thus, activated carbon water purifiers are the best choice if the water supply at your house old is insufficient (condition applied: the water must be soft with fewer impurities). While RO water purifier is the best choice if the water has high TDS and contamination. For increasing the water pressure, a pump can be attached to the RO filter. This will help the filter to work properly.
Water Quality
RO purifiers are the best choice for you if the water supply at your home is high in TDS, salinity and hardness. The RO purifiers contain a semi-permeable membrane with a pore size of .0005 microns. Thus, with such tiny pores, even the tiniest of dissolved, metal, impurities and salt can be removed. while Activated carbon filters are the best choice where the water supply at home is soft and has an average TDS level.