NEW Website!
To better serve our customers and streamline your shopping experience, we've migrated our Sentry water treatment systems to their own dedicated site.
Sentry Scale Control System
Long-lasting, high-performance filtration for evaporative coolers that controls soft & hard scale build-up, chlorine, chloramines & VOCs.
Sentry Scale Control & Filter Kit
Complete pre-filtration kit for use with evaporative coolers.
Sentry Scale Control Filter
Order filter refills for use with EcoSmart Scale Control & Filter Kit.
Superior Products. Quality Solutions.
Celtic Plastics is a family-owned and operated company committed to providing the highest quality and most advanced products in the water filtration industry. Our groundbreaking water treatment products deliver performance and results. By using advanced materials and cutting-edge concepts, we are changing the world with clean water.