Our B-Pure D0809 UltraPure SPG Filter is a premium high-capacity cartridge that removes ionized impurities to produce high-resistivity water with a neutral pH. Making water as pure as possible is ideal for medical or laboratory environments, where absolute clean water is essential. The B-Pure UltraPure SPG filter works with the Barnstead E-Pure and B-Pure water systems and the Bantam Deionizer.