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More Water Purification Knowledge, Easily Learn How to Use Water Healthily

When choosing a water purifier or learn water purification technology, mastering these terms will help you quickly assess product performance and suitability. This page organizes the most common water purification terms for you, helping you quickly know water purification technology.

Pre-filter

Installed at the main water inlet pipe of a home, it is used for the primary filtration of entire household's water supply, removing large particles such as sand, rust, and suspended solids, to protect subsequent equipment from damage.

Backwash
A cleaning method for pre-filters, it washes away impurities attached to the filter screen by changing the direction of water flow.
Manual cleaning
Backwash is performed by manually adjusting a switch or a button to carry out the backwash operation. It is a cleaning method for most pre-filters.
Automatic backwash
Equipped with an automatic control device, it can complete backwash at regular intervals or based on pressure differences, reducing manual intervention.
Working pressure
The water pressure range within which the pre-filter can operate normally. The selected equipment must be compatible with the household water supply pressure.
Pressure resistance
The maximum pressure the equipment can withstand, usually higher than the working pressure, to ensure the safety of the equipment during water pressure fluctuations.
Flow rate
The maximum water flow through the pre-filter per unit time, usually measured in m3/h or L/min.
Pressure loss
The pressure drop when water flows through the pre-filter, usually measured in kPa, affecting the water output efficiency.
Nominal diameter
It refers to the port size of the pre-filter connected to the pipeline, commonly measured in DN, and should match the size of household water pipes.
Filter rating
The size of impurities that can be effectively intercepted, usually corresponding to the mesh size of the filter. It determines the device's ability to remove contaminants.
Mesh size
It refers to the size of the mesh in the pre-filter, usually measured in microns; the smaller the mesh size, the higher the filter rating.
Central Water Purifier

Installed on the main water inlet pipe of a home or building, this water purifier is used to treat water for the entire house by removing odors, residual chlorine, and other harmful substances, making it suitable for drinking, domestic, and cleaning water.

Activated carbon adsorption
It removes residual chlorine, odors, and organic substances from water through activated carbon adsorption, improving the taste and smell of the water.
KDF filter media
Filter media made from high-purity copper-zinc alloy, it removes heavy metals and sulfides from water while inhibiting bacterial growth.
Multi-media filtration
It uses multiple filter materials (such as quartz sand, activated carbon, etc.) to layer and filter different pollutants in the water.
Filter rating
It indicates the smallest particle size that the central water purifier's filter cartridge or media can intercept, determining the purification effect.
Flow rate
The maximum amount of water the device can process per unit time, usually measured in m3/h. Choose the device based on water consumption needs.
Raw water quality
The condition of the water before entering the central water purifier, including important selection indicators such as TDS value, hardness, and residual chlorine.
Treated water quality
The quality indicators of water after being processed by the central water purifier, usually meeting the standards for domestic or drinking water within a certain range.
Residual chlorine removal rate
The effectiveness of the central water purifier in removing residual chlorine from the water, usually expressed as a percentage. The higher the value, the better.
Filter media replacement cycle
The lifespan of the filter media, usually indicated by time or cumulative treated water volume. The filter media needs to be replaced regularly.
Water Softener

A device that reduces water hardness by removing calcium and magnesium ions, primarily used to prevent scale formation and improve water quality, widely used in both residential and commercial settings.

Hardness
It represents the total concentration of calcium and magnesium ions in water, measured in ppm or mg/L. Excessive hardness can lead to scale formation.
Softened water
Water with significantly reduced hardness after being treated by a water softener, effectively preventing damage to pipes and other equipment due to scaling.
Ion exchange
A process where resin adsorbs calcium and magnesium ions from water while releasing sodium ions, thereby achieving water softening.
Ion exchange resin
Used for exchanging hardness ions in water. Strong acid cation exchange resins are commonly used for ion exchange.
Regeneration
After the resin adsorbs hardness ions to saturation, it needs to be rinsed with a salt solution to restore the resin's softening ability.
Regenerant
Usually high - purity sodium chloride, used in the regeneration process of water softener resin to remove adsorbed calcium and magnesium ions.
Bypass mode
During regeneration or maintenance, bypass mode can provide unsoftened water to ensure the continuity of daily water use.
Softening capacity
The amount of water a water softener can process in one cycle, usually expressed in gram equivalents (g) indicating how many grams of hardness ions can be removed.
Salt consumption
The amount of salt required for each regeneration process after the resin in the water softener becomes saturated, usually measured in kilograms (kg).
Automatic control valve
The core component that controls the operation and regeneration of the water softener, categorized into time type, flow type, and time - flow mix type.
RO System

Under high pressure, the RO membrane separates impurities from water molecules, removing dissolved solids, heavy metals, bacteria, and viruses, making the filtered water safe for direct consumption.

RO membrane
A semi-permeable membrane made of polymer materials with a pore size of approximately 0.0001 microns, capable of blocking most dissolved impurities.
Multi - stage filtration
RO membranes are typically used in combination with other filtration technologies (such as PP cotton, activated carbon, etc.) to form a multi - stage filtration system.
TDS
Total Dissolved Solids, indicating the total content of dissolved solids in water, measured in ppm. The lower the TDS value, the purer the water quality.
Wastewater ratio
It reflects the ratio of pure water to wastewater produced by the RO system. For example, 1:2 means that for every 1 liter of pure water produced, 2 liters of concentrated water are discharged.
Tankless design
It utilizes a structure that filters water on demand without the need for a storage tank, preventing potential secondary contamination from the tank.
Raw water
Untreated water source, the water quality status before entering the RO equipment, such as tap water or well water.
Concentrated water
The wastewater discharged during the operation of the RO system, containing a high concentration of impurities.
Pure water
High - purity water obtained after reverse osmosis treatment, commonly used for drinking water or industrial water.
Booster pump
It provides sufficient pressure to push raw water through the RO membrane, an essential component of the RO system.
Concentrated water ratio valve
A valve that adjusts the ratio of concentrated water to pure water to optimize equipment operating efficiency and water quality.
Salt rejection
The ability of the RO membrane to remove dissolved salts from water, usually expressed as a percentage. For example, 99% indicates the ability to remove 99% of dissolved salts from water.
SDI
It indicates the degree of water quality pollution on the RO membrane. The lower the SDI value, the better the water quality. An SDI < 5 is commonly used as a requirement for the feed water of a RO system.
Water production rate
The amount of pure water that the equipment can produce per unit time, usually measured in GPD (gallons per day) or t/h (tons per hour).
Water conductivity
Measured in uS/cm. The lower the water conductivity, the fewer dissolved solids in the water, indicating purer water quality.
1812 RO membrane housing
18 indicates the membrane element's diameter is 1.8 inches, and 12 indicates the membrane element's length is 12 inches (approximately 304.8 mm).
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