How to choose Lab Water Purification
Water purification equipment refers to devices or systems that remove impurities, contaminants, microorganisms, odors, and other harmful substances from water through physical, chemical, biological, or combined processes, making the water meet specific usage standards or safe drinking standards.
The water purification equipment we offer includes purifiers that can provide laboratories with ultrapure water, pure water (deionized water), and RO water. We also offer distillers that purify regular water through distillation. In addition, wastewater treatment systems are available for treating contaminated water.
Before selecting a system, it is important to determine the required water purity based on your intended use. Understanding the type of feed water will help achieve optimal purification performance and extend the lifespan of the equipment.
Feed Water Types
| Instrument / Process Type | Feed Water (Source Water) Type | Main Requirements / Notes for Feed Water |
| RO Water Treatment System | Various natural or municipal water sources, such as tap water, groundwater, seawater, etc. | Usually requires pretreatment to meet the RO membrane feed water requirements (e.g., SDI, turbidity, pH, etc.). |
| Purified Water / Deionized Water Systems | Tap water that meets drinking water standards | The system first filters the tap water, then produces purified or deionized water through ion exchange, electro-deionization, or similar processes. |
| Ultrapure Water Systems | Higher-purity water, such as distilled water, deionized water, or RO water | Tap water must undergo preliminary purification (e.g., RO, ion exchange) before it can be used as feed water. This represents a “further purification” of purified water. |
| Distillation Units | Various untreated ordinary water sources | Feed water requirements are relatively flexible; natural water (e.g., tap water) can be used, with the unit removing impurities through the distillation process. |
| Wastewater Treatment Systems | Wastewater that meets discharge or intake standards | Not all wastewater can be used directly; industrial wastewater often requires pretreatment to reduce pollutant levels (e.g., pH, COD) below specified limits. |
Deionized water (DI water) is high-purity water typically produced from RO (reverse osmosis) water, with most ionic impurities (such as calcium, magnesium, sodium, chloride, etc.) removed through ion exchange.
Purified water is made from RO water as the feed, further treated by deionization (DI/EDI), and meets the ASTM Type II water quality standard.
DI water is not equivalent to purified water. DI water focuses only on ion removal and does not strictly control organic compounds, microorganisms, or particulates (additional treatment may be required). Purified water, on the other hand, consistently meets a defined water quality grade and can be used for most laboratory applications.
Distillers
Distillers separate water from dissolved impurities, inorganic salts, some organic compounds, and microorganisms through the principle of evaporation and condensation.
