The STM150 Reverse Osmosis water filtration system is uniquely designed to produce consistent quality water for the specific reduction of scale causing minerals in boiler based steamer applications. The STM150 RO membrane is designed to reject over 96% of minerals that cause scale build-up and equipment problems. Activated carbon and graded density pretreatment protect the RO membrane. The post-treatment filters adjust the product water to allow electronic probes to function correctly in water conditions up to 2,000 ppm TDS.