1： Galvanized pipe

Galvanized pipe is one of the earliest pipes to be put into use and is widely welcomed due to its low cost. However, due to its susceptibility to rust and blockage, it can cause secondary heavy pollution of drinking water, seriously endangering human health. Therefore, it is natural to prohibit its use.

2： PVC-U pipe

PVC-U water supply pipe is one of the earliest pipes used to replace galvanized steel pipes, which has advantages such as good flame retardancy and low price. However, due to the use of adhesive bonding, the connection reliability is poor, the pressure resistance is low, and it is not suitable for conveying hot water. What is difficult to ensure is hygiene. This is because the adhesive and PVC-U Jun contain chlorine components, although they have been modified, However, in the process of constantly changing external conditions, chlorine components will also be slowly released, thereby affecting water quality.

3： Aluminum plastic composite pipe has good hygiene performance that galvanized pipe and PVC-U pipe do not have. It is composed of a layer of aluminum strip sandwiched between the inner and outer layers of plastic. The bonding force between the aluminum layer and plastic, especially the cross-linked polyethylene layer, is weak, making aluminum plastic pipe easy to cause delamination and damage when used in hot water pipeline systems. Due to the inability of aluminum plastic pipe composite pipe to be hot melt connected, it can only be connected by clamping metal connection, The water leakage of aluminum plastic composite pipes found in various places is actually caused by the inconsistent thermal expansion coefficient of the connecting materials.

4： PPR tube

PPR pipes are a new generation of green pipeline products produced by introducing foreign technology and raw materials in the mid-1990s. However, PPR pipes also have the disadvantages of low temperature brittleness and excessive expansion coefficient. Moreover, PPR pipes contain dirt and are a breeding ground for a large number of bacteria. The internal sampling and testing results of PPR pipes' inner wall dirt after use for a period of time in the pipeline industry are: a yellow rust nodule containing up to 50 types of various bacteria.

5： Copper tube

Copper pipes also have a series of advantages such as low flow resistance, heat resistance, frost resistance, pressure resistance, and no radiation aging. At the same time, they are also high in cost, require high welding skills, and the expansion force of copper is large, requiring the installation of specialized expansion elimination devices. Copper pipes that are in a prohibited state for more than 4 hours will produce excessive copper green. Copper green is toxic and can be used as an insecticide, which has astringent and sulfuric acid corrosion effects on the human body's internal mucosa. It has a strong irritant effect on the intestines and can cause reflex vomiting (for human health, copper in drinking water should not exceed 2mg/L and there is an odor in the water). Measures: When the water pipe is still for more than 4 hours, empty 10L of the water before use.

Sixth generation: thin-walled stainless steel water pipes

Thin walled stainless steel water pipes reflect high-tech and high-quality products. The pure stainless steel water pipe system can be maintenance-free for 70 years, and the price reflects the equivalent consumption level of long-term benefits. It is a preferred product for residential communities and important projects, and also a reliable choice for citizens who increasingly value drinking water quality. It is worth the money and allows you to benefit from one investment for a lifetime. Stainless steel water pipes are connected using advanced clamping fittings. They are successfully and reliably clamped using special tools at the construction site. There is no high-temperature open flame at the construction site, there is no residue in the pipeline, and there will be no water blocking. This is a relatively simple and advanced connection method.