Our Story
Decades of innovation in reverse osmosis water purification
Built on Innovation
Big Sky Water Supply is the authorized distributor of WOW RO™ reverse osmosis systems — a revolutionary Water-on-Water™ technology that delivers cleaner, more efficient water purification than traditional RO systems.
Our systems are NSF/IAPMO certified, made entirely in the USA, and protected by multiple patents. Whether you need clean drinking water for your home, office, RV, boat, or commercial kitchen, we have a solution engineered to perform.

The Water-on-Water™ Breakthrough
Traditional reverse osmosis systems use an “air-on-water” design where processed water is stored in a tank with a separate air compartment. As water fills the tank, it compresses against the air cell, reducing pressure to the membrane and producing lower quality water with more waste.
The WOW RO™ system eliminates this problem entirely. Using a patented Water-on-Water™ design, our systems operate with zero back pressure on the membrane — the exact condition membrane manufacturers use for testing. The result is higher quality water, less waste, and a longer-lasting system.

Engineered for Simplicity
At the heart of every WOW RO™ system is the patented CPU Valve — an engineering marvel consisting of just four parts, with only one that moves. Previous Water-on-Water designs required as many as 50 intricate components. This breakthrough simplicity means fewer failure points, easier maintenance, and exceptional reliability.
The system also features a fast-forward flushing membrane that scrubs itself clean during every use, extending membrane life and maintaining peak performance with an industry-leading waste ratio.
Why Big Sky Water Supply
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NSF/IAPMO Certified
Every system meets rigorous third-party testing standards for safety and performance.
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Made in the USA
Designed and manufactured domestically with premium materials and quality control.
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Multi-Patented
Protected by multiple issued and pending patents — technology you won’t find anywhere else.
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Expert Support
Our team has decades of experience in water purification and is here to help every step of the way.
Ready to Experience the Difference?
Browse our full catalog of RO systems, replacement parts, and accessories — or reach out to our team for personalized guidance.