The selection of water treatment process flow and the composition of main structures shall be determined through investigation and research, tests of different process combinations, or reference to the operation experience of existing water plants under similar conditions, combined with local operation and management conditions, and comprehensive technical and economic comparison, based on raw water quality, designed production capacity, and treated water quality requirements.

Resistivity The electrical conductivity of water is related to its resistance value. A higher resistance value means poorer conductivity, while a lower resistance value means better conductivity. According to Ohm's Law, at a constant water temperature, the resistance R of water is inversely proportional to the vertical cross-sectional area F of the electrodes and directly proportional to the distance L between the electrodes: R=ρ·L/F. In the formula, ρ refers to resistivity, also known as specific resistance. The unit of resistance is ohm (symbol Ω), or microohm (μΩ); 1Ω equals 10⁶μΩ.

Check the packaging integrity of pipes and fittings before construction; clean up those with damaged packaging.

Hydraulic fracturing used in shale gas extraction consumes a huge amount of water resources. For this, most members of the public worry whether the water mixed with chemicals and sand will pollute groundwater resources; experts are concerned about how to properly dispose of the water that returns to the surface after fracturing; while businessmen are enthusiastic about the huge dividends brought by the emerging market of post-fracturing water treatment.