The Printed Circuit Board Etching Tank, created in November 1993, aids in the creation of homemade circuit boards by enhancing and speeding up the etching process. The system is comprised of an acrylic tank, aquarium heating element with thermostat, and aquarium air pump.

A copper-clad circuit board printed with ink or toner resist and ready for etching is submerged into the tank, which is filled with ferric chrloride. The bubbles created by the fishtank air pump help to agitate the circuit board while the heating element expedites the chemical action between the copper and ferric chloride.