Add a little Elsan Grey Water Tank Fresh 2 Litre to your water drains to get rid of stale odours. The Tank Fresh doesn't just mask smells from your sinks, showers and drains, it eliminates them completely from your caravan, motorhome and boat grey water system.
And when added regularly, Tank Fresh also dissolves grease build-up to help keep everything clean, fresh and free flowing. Once you've tried it, you'll never put up with bad odours from your grey water system again.