Coarse filter is suitable for pre-filtering air-conditioning systems. It mainly can filter dust particles more than 5μm. Coarse filter has three types, that’s plate type, folding type and bag type. Its frame materials are paper box, aluminum frame; galvanized iron frame and the filter material are non-woven, nylon mesh, activated Carbon Filters, and metal hole net.
In order to know coarse filter approach, you should learn its usage firstly. Remove the lid from a 2-liter soda bottle and empty the contents. Hold the bottle upside down so the small threaded spout is pointing down. Insert the blade of a knife 1 to 2 inches from the bottom of the bottle. Cut completely around the bottle and remove the bottom. Place a hand full of pebbles, 1/2 inch to 3/4 inch wide, in the bottle above the spout to help hold the smaller materials in the 2-liter bottle for filtration. Add a layer of 2 to 3 inches of small gravel on top of the pebbles in the bottle to act as a coarse filter. Fill the bottle to within 3 or 4 inches of the open bottom with sand, which will serve as a fine filter to remove sediment and mud from the water. Pour water over the sand in the bottle filter and allow it to work its way down through the filter. Place a cup or container under the threaded bottle opening to collect the water.
If you want to pay attention to some tips of Coarse filter approach. First of all, trim the plastic bottles if they do not fit snugly into each other. If preferred, a beaker can be used as a water collector. After that when cleaning the filter, pour the water from a low height so that it does not disturb the sand for the fine sand use beach or play sand and for the rocks use natural color aquarium rocks. If you want to make even cleaner water add a layer of carbon on top of the fine sand. You should bury this in mind that does not drink the water in any situation because the filter is for experimental purposes only. Last but not least, be careful when cutting the bottles, and use adult supervision if necessary. Dirty water can contain bacteria. Wash your hands with soap after handling it.
Coarse filter approach is very easy due to its advantages. Coarse filter is characterized by low cost, light weight, versatility, compact structure. It is mainly used for central air conditioning and central ventilation system pre-filter, Pre Filter large air compressor, clean air return system and local high efficiency filter pre-filter. High temperature air filter Used stainless steel frame which is capable of a high temperature reaches 250-300 ℃.
All in all, this is the coarse filter approach to using it. If you are interested in coarse filter, you can visit www.hefilter.com.
