The faucet on the market containing trace amounts of lead are mostly cast copper alloys. The lead containing 4% – 8% of lead will oxidize after encountering air to form a protective film. When it meets Water, this protective film will fall off, so that lead will be mixed into the water, causing lead to precipitate 0.2. The main material used in the leading casting process is the brass HPb59. The brass is an alloy of copper and zinc. When the lead element comes into contact with air, it will oxidize to form a protective film. Lead to fall off and immerse in water, during causing precipitation of lead elements. At the same time, since tap water uses chlorine as a disinfectant, residual chlorine in the water accelerates aging of the faucet and lead precipitation. The use of copper faucets and water pipes for more than 5 years will increase the amount of lead by a large amount of 0.3, and the use of recycled copper as a raw material for lead materials will increase. When the industry is just emerging, some Consumers that the heavier the faucet, the thicker the wall thickness and the increased resistance. As time goes by, some unscrupulous merchants use recycled copper (remaining copper residue from other factories to refine) as raw materials in order to cater to consumers’ consumer Psychology of focusing on product weight, adding stainless steel parts or other alloy parts to the faucet (such as Zinc alloy), the use of high-lead parts in the faucet, resulting in increased impurities, directly causing serious heavy metal content of the product , and secondary pollution of water.
Precautions during use of the faucet:
1. After the tap water is deactivated for several hours, be sure to turn on the faucet for 1 to 2 minutes before use. Do not drink the overnight tap water.
2. Now many families have hot water supply. But it is best not to use it as drinking water or cooking, because the amount of lead in hot water is many times higher than cold water.
3. when buying faucets, we must pay attention to the selection of free lead products.
4. Installed the water purifier.According to the degree of filtration, the water purifiers on the market can be divided into coarse filtration (activated carbon adsorption), ultrafiltration and reverse osmosis three types from coarse to fine filtration mode. From the filter material of the water purifier, most of the inner cores will use PP cotton, activated carbon and other materials, among which the higher price ones will use RO reverse osmosis membrane. RO reverse osmosis membrane pore size is as small as nanometer, in certain Pressure, water molecules can pass through the RO membrane, and inorganic salts, heavy metal ions, organic matter, colloids, bacteria, viruses and other impurities in the source water cannot pass through the RO membrane.