... is made of high-quality plastic, etching water flow through resistant-corrosion etching pumps, passing storage ... paper which is at the bottom of the water pump, fix the worktable. 2, machine inspection ... L into machine which is better that the water level no more than corrosion platform. Insert the ... pumps could work. If normally work, take out water to standby. 3, confect ferric chloride solution: ...