Frequently Asked Questions How can I prevent green algae in my steam generator’s tank? It is very easy to prevent green residue or algae in your steam generator iron’s water tank. Please see here for more information on what you need to do. Empty the water container regularly Emptying your steam generator’s water container regularly will prevent the formation of algae or residues. Algae can form when water remains in your iron’s tank for a long time. By emptying the water tank after each usage, algae can’t be formed and your water tank will remain clean. Clean your water tank If green algae has built up in your steam generator iron’s tank, you can try the following: 1) Fill the water tank half way with hot water and shake it carefully. 2) Empty it and rinse well with fresh water (do not use detergent). Please do not worry if the algae remains: it will not affect the quality of the steam produced by the iron. Note that emptying the water tank after each use will help prevent further algae build up.