Question
For purifying her drinking water, Geeta has to buy either reverse osmosis filter or an ordinary electric filter. Help her take a decision by giving her all the necessary information she would require about these filters.
Solution
| Electric filter | Reverse Osmosis | |
| (i) | Take care of suspended particles. | It has sediment filter which removes suspended particles. |
| (ii) | Carbon granules remove chemical impurities. | The activated carbon filters remove chemical and enhance the taste. |
| (iii) | Ultraviolet light kills germs and microorganisms. | Semi-permeable membrane removes lead, arsenic etc. |
| (iv) | Not able to remove e-coli virus. | Remove all e-coli virus. |
| (v) | Cheaper | Expensive |
| (vi) | Works well in soft water | Can work any type of water |
| (vii) | Filter gets changed every six months | Filter needs to be changed once in a year. |
| (ix) | Easy to maintain & no wastage of water. | Wastage of water. |
