We were experiencing very bad smells from our grease trap located in our kitchen - these smells were making their way out into the restaurant which was leaving a bad impression on our customers. Ecotec advised us to install a system to dose the trap nightly with Drainshield- within 24 hours the smells were eliminated and have not returned. The grease trap is also performing far more efficiently and requires far less maintenance and the costs are relatively minor. Many thanks to Ecotec and Drainshield!