Monday, November 28, 2005

Painting Mediums

Paint and paintings materials differ depending up on the place where it is to be painted whether it is an interior painting or exterior. Interior paintings basically use materials such as oil paint, water colors, wooden board, fabric etc where as exterior paintings involves using water resistant base and mediums.

Thursday, November 17, 2005

Water -Filters:

Filters are the devices that help to remove impurities from water by means of a physical separators or chemical instruments. Filters cleanse water for irrigation, drinking water, aquariums and swimming pools. They can also be bought in the shops for domestic purpose. Two major brands are PUR and Brita. These filters take away the impure contents from the water. The presence of such impure contents may cause diseases like cancer, jaundice etc and things that taste or smell bad. The composition of filters is based solely on sieving, ion exchanges and other processes.

Types of Water Filters
UV Filters:
UV Filters have the ability of killing the majority of bacteria and viruses present in the water and one, which passes through them. Chemical pollutants will not be removed from the water with UV filters. The treatment is not efficient beyond the area of treatment, so water should be used as immediate as possible after it is treated.

Sand Filters:
Sand based water filters are generally used for more than hundred years for wastewater treatment. These filters are used on a larger scale to treat a water supply for a whole community, and they are custom made. Normally any apparatus needs a constant flow of water to work properly, and hence they cannot be used for well water treatment. Recently a Canadian scientist, David Manz developed an intermittent unit. You can buy pre-built units for domestic use, which are generally used in swimming pool pumps.

Charcoal Water Filters
These are generally from coconut husk as a filter medium. This generally takes in impurities as the water passes through. This form of filter comprises possibly 95% of those in use domestically, because they are very easy to install, they are comparatively cheaper, and filter out the dreadful contaminants, Cryptosporidium and Giardia. An average charcoal filter will last a family 6-9 months. They are also enhanced by the use of activated silver, which provides extra antibacterial power of filtering. Minerals in solution can still enrich a charcoal filter. Such Minerals improvise health.

Reverse Osmosis Water Filters

They make use of a semi-permeable membrane to filter through osmotic process. They take all the impurities out of the water, leaving it pure that is stated in Usually installed under-sink, it needs a person to come every few months to install a new membrane.

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