Ultrafiltration water treatment systems treat South Australia’s groundwater, surface water, tertiary treated effluent, or stormwater. Freshwater Systems is a South Australian-owned and operated business specialising in manufacturing and distributing water treatment equipment. Our team boast over 60 years of industry experience, meaning we are the best company to handle your water treatment needs. We have cemented a position in the Total Water Management industry, and we are recognised as a local industry leader.ia