The Best Water for Your Life San Antonio, TX Seki Water System is a water treatment provider located in San Antonio, TX. We offer affordable water softeners and reverse osmosis systems. Shop Now! Menu Water Solutions Do you have water problems? Typical solutions for water issues are here. Check it out! More Info Blog Seki Water publishes useful information about water treatment. Let’s discover! More Info Shop Seki Water offers water softener and reverse osmosis systems for residences and restaurants. More Info Questions? Call Now! (210) 367-2536 Contact Us!