What is the waste product of electrolysis?

The waste product of electrolysis can vary depending on the substances being electrolyzed. For example, in the electrolysis of water, hydrogen gas is produced at the cathode and oxygen gas at the anode, with little to no waste. However, in the electrolysis of saltwater, chlorine gas can be released as a byproduct along with hydrogen. Overall, the specific waste products depend on the electrolytic solution and electrodes used.