Check the listing for details. 4X Replacement Resin Filter For Hydrogen Generator H2 Inhalation Machine 150ml/m. Color: White, Condition: New. Listed at 17.50 USD. perating Instructions for Filter CartridgesInstructions for use:①For the first use, please install the filter element. (Note: Unused filter elements need to be kept in a vacuum seal) ②The function of the filter element: ensure the water quality and improve the life of the hydrogen production tank.Installation instructions:①. Open the filter cover on the top of the hydrogen generator.②. Tighten the new filter element to the filter element cover.③. Put the filter element into the device and tighten the filter element cover to complete the installation.NoteIt is recommended that the equipment be used for about 100 hours to replace the filter element; when the equipment is not used for a long time (more than 7 days), it needs to be replaced with new pure water.