These devices produce Type II water based on ASTM (American Society of Testing and Materials) standards, supplied by network water.

They can produce from 3 to 10 liters per hour depending on the model. They use methods that may combine reverse osmosis with deionization and the use of special pre-filters and final filters, aiming to produce high-quality Type II water, while also always producing fresh water of this type without it being subject to alteration by remaining stagnant. They operate with a digital microprocessor and feature a high-definition digital display that shows the quality of the produced water in μS/cm with an accuracy of ±0.1 μS/cm, the phase of the production process, and possibly warning symbols (any malfunctions or filter change notifications). We can also monitor the operating hours of the individual components of the device, other conductivity measurements (of the supply water, the water in the reverse osmosis membrane, the produced type II water), the % performance of the reverse osmosis membrane, and the water temperature through the screen.

These devices also have special resins through which the water passes after the reverse osmosis membranes, resulting in water with extremely low conductivity ≤0.5 μS/cm. There is also the possibility of installing a UV lamp to significantly reduce bacterial contamination—if such a requirement is specified by the user—combined with a final 0.2μ filter, resulting in a bacterial concentration of ≤1ufc/ml.

The main applications that require Type II water are the preparation of biological cultures, the preparation of reagents and standard solutions, the cleaning of materials in controlled condition chambers or test chambers with saline solution, the supply of water to devices that produce Type I water, and finally for wet sterilization ovens or feeding systems for aquaculture tanks. The general fields of application include research and analytical laboratories, greenhouses, the beverage and food industry, hydroponic cultivation, the chemical industry, the cosmetics and pharmaceuticals industry, veterinary medicine, etc.