How does a water filter work?
A water filter lets tap water pass through a barrier. That barrier catches dirt, germs, and some chemicals. Clean water comes out the other side. Different filters catch different things. Some remove only dirt. Others also take out taste, smell, and dissolved salts. The right choice depends on your water.
Ceramic water filters
A ceramic filter uses a hard clay candle with very small pores. Those pores block dirt, mud, and many germs. Water drips through slowly and comes out clear. You can clean the candle with a soft brush. One candle lasts a long time. Ceramic filters work well when water looks cloudy.
Carbon water filters
A carbon filter uses activated charcoal. The charcoal absorbs bad taste and smell. It also traps chlorine and some chemicals. Water tastes fresher after it passes through. Carbon alone does not remove all germs. Many jug and tap filters use carbon. You need to change the carbon every two to three months.
Reverse osmosis (RO) filters
An RO filter pushes water through a fine membrane. The membrane blocks the smallest particles. It removes dissolved salts, metals, and most germs. RO gives you the cleanest drinking water. It also wastes some water while it runs. It needs more space and a bigger budget too. RO suits homes with hard or salty water.
UV water purifiers
A UV purifier shines ultraviolet light on the water. The light kills germs and bacteria. It does not remove dirt or chemicals, so people usually add a carbon or ceramic filter first. UV needs power to work. It acts as the final safety step. The World Health Organization sets safety standards for drinking water and home treatment.
Which water filter should you choose?
Match the filter to your water problem. Use ceramic for cloudy or dirty water. Use carbon for bad taste and smell. Use RO for salty or hard water. Use UV to kill germs as a final step. Many homes use two types together. Not sure if you need one? Read whether is tap water safe to drink in Sri Lanka first. When you are ready, compare water filters in Sri Lanka by type.
Frequently Asked Questions
What are the main types of water filters?
The main types are ceramic, carbon, reverse osmosis, and UV. Ceramic blocks dirt and germs. Carbon improves taste and smell. RO removes dissolved salts. UV kills bacteria.
Which water filter removes the most?
A reverse osmosis filter removes the most. It uses a fine membrane to take out dissolved salts, metals, and most germs. It works best in hard or salty water.
