Water purification generally means freeing water from any kind of impurity it contains, such as contaminants or micro organisms. Water purification is not a very one-sided process; the purification process contains many steps. The steps that need to be progressed depend on the kind of impurities that are found in the water. This can differ very much for different types of water.
Egypt is located on the Nile River, and the Nile River passes on the developing countries.
Pollution in the Nile disastrous proportions, and is one of the main causes of the high rates of disease in Egypt.
Water sterilization in Egypt, is through a primitive process used in it alum and chlorine, and this method does not guarantee you healthy drinking water, and researches have shown that alum and chlorine caused malignant diseases.
RO is the most convenient and effective method of water filtration. It filters water by squeezing water through a semi-permeable membrane, which is rated at 0.0001 micron (equals to 0.00000004 inch!). This is the technology used to make bottled water; it is also the only technology capable of desalinating sea water, making it into drinking water.
Non-RO water filters are much less effective, and the pore size on these filter media are much bigger, generally 0.5 - 10 micron. They can filter out coarse particles, sediments and elements only up to their micron rating. Anything finer and most dissolved substances cannot be filtered out. As a result, water is far less clean and safe compare to reverse osmosis filtration.