What is the function of household water purification system? How to choose?
It is suggested to plan and select water purification equipment according to the actual water hardness and TDS of the family, combined with the demand for drinking water, the number of water points and domestic water consumption.
Household water quality problem 1: the water quality is unclean and particulate impurities exist.
Field situation: Because the water source in this area is tap water, the pipe network is in disrepair for a long time, and the cleaning of water tanks is not up to standard, which will bring a lot of particulate impurities and rust.
Design analysis: In order to protect the wading equipment and shower, it is necessary to intercept the particulate impurities and rust in tap water, and the water inlet supervisor must install a pre-filter. The pore size of the common pre-filter screen in the market generally has three grades: 20/50/ 100 micron. Although the filtration accuracy of 20/50 micron is high, it has great influence on tap water pressure. Measuring the water supply pressure of local tap water, the water supply pressure is low, so it is impossible to have a big pressure loss.
Solution: 100 micron pre-filter screen is selected for design.
Family water quality problem 2: different colors, smells and heavy metals.
Field situation: excessive chlorine and other disinfectants will be added during tap water treatment, and chlorine residues and their derivatives will endanger human health. In addition, the problem of heavy metals can not be ignored;
Design and Analysis: In order to remove residual chlorine and its derivatives in water, the common way in the market is to use activated carbon water purifier, which relies on the super adsorption of activated carbon to eliminate residual chlorine. According to the National Standard for Tap Water Quality in People's Republic of China (PRC) and Hygienic Standard for Drinking Water (GB5749-2006), the iron and metal content in tap water is 0.3 mg/L; The content of manganese metal is 0. 1mg/L, and the heavy metal seriously exceeds the standard, so it should be fully considered in the design and reasonable equipment should be selected for purification.
Solution: According to the analysis of the above scheme, the central water purifier with activated carbon filter and heavy metal removal filter (MINOX) was designed and selected.
Family water quality problem 3: serious scaling
Field situation: water hardness: PPm (calculated by CaCO3 in the national standard): 310 ~ 380; DH (German degree): 18-22. Design and Analysis: According to the national sanitary standard for drinking water, the total hardness limit is 450 (calculated by CaCO3), and it is obvious that the hardness of water in this area is very close to the limit. According to the hardness grade of tap water, tap water belongs to hard water grade and needs to be softened. Otherwise, the scaling of wading equipment is serious, the energy consumption of hot water equipment is high, the service life of equipment is greatly attenuated and the quality of hard water is poor.
Solution: Design and selection of central water softener.
Family water quality problem 4: it contains bacteria and viruses, so you can't drink raw water directly.
Field situation: tap water contains all kinds of invisible bacteria and viruses, so it can't be drunk directly. There are two main kinds of bacteria living in tap water, Escherichia coli and Legionella. The former can be extinct after boiling for 3-5 minutes, while the latter is easy to breed and spread in warm water, such as shower and jacuzzi.
Design and analysis: In order to solve the problem that tap water can not be drunk raw, high-precision filtration technology is mainly adopted. At present, the mainstream processes are ultrafiltration and RO reverse osmosis. Knowing that customers pay attention to food safety and have a healthy concept of balanced daily food nutrition, it seems that customers prefer safe drinking water and balanced water quality and minerals.
Solution: Design and select compound terminal ultrafiltration drinking water equipment.
To sum up, the selection of water purification system is: pre-filter+central water purifier+central water softener+terminal drinking water equipment, and the selection design requirements are as follows:
1) Kitchen drinking water is taken separately after the central water purifier and before the central water softener (soft water is not drinkable).
2) Water for garden watering is received after the prefilter and before the central water purifier.