A sealed glass box is made with a lid which slides in aluminium u-channel.
The glass box has separate plastic containers for bicarbonate of soda, battery acid (sulfuric acid) and sodium-bi-sulfate which is sold under the trade name of Sparex in the jewelry supply houses.
Far cheaper suppliers, are the pool supply companies who sell the exact same product, but call it "Ph-down", as a chemical used to regulate acidity of swimming pool water.
