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Spa filters work continuously to keep debris and sediments from the water in a spa pool. ==Cartridge filters== Cartridge filter technology was invented in the mid-1960s, cartridge filters have a large surface areas enabling them to operate for long periods. Cartridge filter systems also permit better water flow – thus, placing less strain on the filter pump. These types of filters are also easiest to clean by using a flow of high-pressure water from a hose. The filters are made of polyester or other material that can provide a superfine filtering surface. The pleats are the key to the filter's operation. The tight pleats, or folds, allow for a large amount of material to be used in a small container. The more material used, the larger the surface area available to capture dirt or debris from the water. The fabric catches and holds the impurities until the filter can be cleaned or replaced. There 3 parts to a cartridge filter construction,end caps (made of plastic) core structure to provide strength (most often PVC) and the pleated media (most often polyester with a continuously graded fixed pore structure, these cartridges provide pre- and final filtration within the same cartridge resulting in lower overall filtration and disposal cost. Two methods are used in spas with respect to cartridge filters, pressurized canisters,in which the spa filter is not visible when in use, and secondly flow through systems, which are visible when in use and often the spa has 1-5 filter cartridges in this design. Flow through filter system in spas and hot tubs are the preferred method of design today for all major hot tub brands. The cartridge can filter out anything down to about 5 to 10 micrometres in size. In most areas cartridge filters are less expensive than diatomaceous earth filters but cost more than sand filters. However cartridge filters are more popular because of the minimal maintenance involved. In some cases it may be sufficient to simply hose off the cartridge filter a few times during swimming season to keep them working properly. Others may need to soak the filters in detergent or replace them. In any case, maintenance takes only a few minutes to the filtration system operational. There are more than 500 shapes and sizes of spa filter cartridges in use today . 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Hot tub filter」の詳細全文を読む スポンサード リンク
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