This basic series is ideal for wide range of applications. It produces RO, Deionized water and Ultrapure water. The organic rejection rate is greater than 99% using reverse osmosis. The resistivity reaches up to 18.2M?.cm which completely meets the highest grade I standard. - Built-in 20 liters airtight plastic pressure water tank - Built-in 13 liters high-capacity polishing resin cartridge - Unique design and easy-to-replace cartridges pack unit. - Data storage and RS 232/USB communication port.