For either type of filter system, consistent maintenance and periodic filter replacement is essential to ensure effectiveness and prevent bacterial build-up.For all work on your filter system, use only a licensed plumber or licensed water conditioning contractor.It removes the chemical before it can be ingested, breathed in, or absorbed by the skin during washing or bathing. Whole-House Filter SystemĪ whole-house filter system treats all water traveling to any faucet or fixture in the home. Not all contaminants easily evaporate into the air or are absorbed through the skin. Inhalation is a concern when the chemical easily evaporates from the water into the air. It will not protect people from inhaling the chemical while showering or bathing, prevent the chemical from being absorbed through the skin, or protect other water faucets. (Exposure pathways are the ways that chemicals enter the body.)Īn under-sink filter protects people from ingesting the chemical by treating the drinking or cooking water only from that tap. Exposure pathways that need to be eliminated.The type and amount of contaminants in the water,.Other examples of point of use filters are the GAC pitcher filters commonly sold in grocery stores or GAC filters that are a part of a refrigerator’s icemaker. Water from the separate tap will be GAC-treated, and water from the main faucet (hot or cold) will be untreated. One example is an under-sink unit water passes through the carbon filter and travels to a separate water tap, next to the main faucet. When the system is bypassed, the water entering the home is NOT being filtered.Ī point of use (POU) filter is installed in the water supply pipe just before the faucet where people get water. Most systems also have a bypass switch that allows the water flow to bypass the system when needed for chlorination or certain plumbing activities. Sample ports located before, between, and after the filters allow for testing of the water at each location (see diagram on the next page). When the first filter is used up, the second filter is moved to the first position and a new filter is placed in the second position. Two filters arranged in sequence ensure that any chemical that might get past the first filter is trapped by the second. The filters are usually installed as a pair, although more may be required in some situations. The example shown in the photo is about 4-feet tall and 15 inches in diameter. The filters are usually cylindrical in shape. It removes the chemicals before they can be ingested, breathed in, or absorbed by the skin during washing or bathing. Whole-House Filters or Point of Entry:Ī whole-house filter is installed at a point on the home's water supply plumbing that will result in treatment of all water that travels to any faucet or fixture in the home (but typically will exclude outside faucets to prolong the life of the carbon). There are two types of GAC filter systems: 1. How often the GAC should be changed needs to be based on contaminant levels and water use. While some filters may last for several years if contaminant levels and/or water use are low, higher levels or use may require more frequent change-outs. Eventually, the ability of the GAC to bind and remove chemicals is used up and the GAC needs to be changed. All treatment systems require proper installation and periodic maintenance. It is very important that the type and concentration of contaminants, and average water use, be known in order to determine the correct size and components of the system. The activated carbon removes certain chemicals that are dissolved in water passing through a filter containing GAC by trapping (adsorbing) the chemical in the GAC. Heat, in the absence of oxygen, is used to increase (activate) the surface area of the carbon this is why these filters are sometimes referred to as “charcoal” filters. Granular activated carbon is made from raw organic materials (such as coconut shells or coal) that are high in carbon.
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