How long is the replacement period between the primary filter and the medium filter? 1.The primary air filter is suitable for primary filtration of air conditioning system,It is mainly used to filter dust particles above 5um.The primary filter has three styles: plate type, folding type and bag type,The outer frame material has paper frame, aluminum frame, galvanized plate frame,The filter materials include non-woven fabric, nylon mesh, activated carbon filter material, metal pore mesh, etc.2.Medium-efficiency filters are widely used in intermediate filtering of air conditioning systems,Mainly used for filtering 1-Dust particles above 5um,It has the advantages of small resistance and large air volume.
I heard that bottled water is filled with tap water. Is it true? 1. one-sided understanding,A stick knocked everyone down.Pure water is a kind of water after reverse osmosis treatment of tap water,Mineral water and mountain spring water are water species that are precisely filtered from the ground or surface water,Wait,As long as it is bottled water produced by regular manufacturers,All water that can be safely drunk after treatment;2. there are indeed some illegal profiteers in the market who fill bottled water with tap water that is not treated,And it's still a 'black bucket ',Seriously affect the health of consumers;3. choose bottled water with local reputation and brand.Bottled water is the tap water that is filtered into the bucket. this is true,When I was in college,There is a water company near the school,When I passed by that day, I saw them bottled water with a running water pipe.Generally speaking, some self-employed people make bottled water,Rent a shop,Then dig a well inside,Put another electri