Walex Dura-Blue tank dyeWalex’s Dura-Blue is an enhanced non-staining color dye that will last longer in overused holding tanks where pH shifts are common. It withstands heavy use and high temperatures. All Walex liquids and Paks now use Dura-Blue. Dura-Blue does not negatively impact wastewater treatment plants. www.walex.com; 800-338-3155
