Mechanical filtration equipment, also known as pressure filters or filtration tanks, serves as the pretreatment unit for water purification systems and is a vital component of water treatment equipment. Depending on specific customer requirements, the tank materials can be FRP (Fiberglass Reinforced Plastic), steel-lined rubber, or stainless steel. As water purification equipment, mechanical filters are classified based on the filtration media used. The filter media can include natural quartz sand filters, multi-media filters, activated carbon filters, manganese sand filters, and ion exchangers, among others. Mechanical filters, as water purification equipment, have different primary functions depending on the media used. These functions include filtering out suspended solids and mechanical impurities, removing organic colloids, eliminating color from water, reducing residual chlorine, removing ferrous ions (divalent iron) from water, and softening water quality.

Electrodialysis (EDI) chemical water treatment equipment is a combination of an electrochemical process and a dialysis diffusion process. Driven by an external direct current electric field, it utilizes the selective permeability of ion exchange membranes (i.e., cations can pass through cation exchange membranes, and anions can pass through anion exchange membranes), causing cations and anions to move toward the cathode and anode, respectively. During the ion migration process, if the fixed charge of the membrane is opposite to the charge of the ion, the ion can pass through; if their charges are the same, the ion is repelled. This achieves the purposes of desalination, concentration, refining, or purification of solutions. Compared to reverse osmosis, another membrane separation technology introduced in recent years, electrodialysis ultrapure water equipment is cheaper but offers a higher desalination rate. Currently, the quality of domestically produced ion exchange membranes is also very stable, and operation and management are quite convenient.

Ultrafiltration (UF) is a membrane separation technology driven by pressure difference, utilizing the high-precision interception capability of UF membranes for solid-liquid separation or the classification of substances with different molecular weights. Compared to reverse osmosis (RO) water treatment equipment, UF operates at lower pressures, resulting in lower equipment investment and operating costs. It involves no phase change, has low energy consumption, and offers high membrane selectivity. The principle of ultrafiltration water treatment involves using an asymmetric microporous structure and a semi-permeable membrane medium at room temperature under a certain pressure and flow rate. Relying on the pressure difference across the membrane as the driving force, filtration is carried out in a cross-flow manner. This allows solvents and small molecular substances to pass through, while macromolecular substances and fine particles such as proteins, water-soluble polymers, and bacteria are retained by the membrane. This achieves the goals of separation, classification, purification, and concentration, making it a new type of membrane separation technology.

Common disinfection equipment used for water purification includes chlorine dioxide disinfection systems, flow-through ultraviolet (UV) sterilizers, and ozone disinfection systems. Each type of disinfection equipment has its own advantages and disadvantages. To achieve optimal disinfection results, it is necessary to select different disinfection equipment based on the specific requirements of different industries.