RO filtration cleans water by taking out the totally dissolved solids (TDS) which contaminate the water. RO membrane removes an average of 95% of dissolved contaminants. RO works by using pressure to force the water solution through membrane, retaining the TDS on one side and allowing the pure water to pass to the other side. Usually this system is suitable for bakery, coffee shops and etc. PWT-TANKLESS SSL-1200 is a system featuring on-demand, continuous-flow water production. With NO storage tank to fill, the reverse osmosis unit does not run until RO water is needed. PWT-TANKLESS SSL-1200 low-energy membrane to purify at 1200 ±20% gallons of water per day. Possibility to use only one membrane in case with 750 ±20% gallons of water per day.