Upgraded 10% Crosslink Resin Water Softener by AFWFilters. System Features - Fleck 5600SXT digital metered control, Black resin tank, Stainless steel 3/4" bypass valve, Standard black brine tank with safety float, Chlorine resistant upgraded resin (10% Crosslink), Bypass valve 3/4" stainless steel. Tank comes preloaded for easier install. AFWFilters designed system is backed by a friendly knowledgable support staff that can help answer any questions you may have. Installation instructions provide guidelines that allow most homeowners to install the system themselves, and video installation tips are available as well.