Custom Premix Selecting "Custom Premix" option means that all of the beads you have chosen will be premixed in manufacturing before the kit is sent to you.
Safety Data Sheet for Polygard-CR Cartridge Filter 30 in. 3.0 µm Code 7 Silicone CR0373006
Material Safety Data Sheet or SDS for Polygard-CR Cartridge Filter 30 in. 3.0 µm Code 7 Silicone CR0373006 from Merck for download or viewing in the browser.