British Columbia has revised this bulletin to clarify how PST applies to catalysts and direct agents. A catalyst is a substance that remain sunchanged at the end of the reaction that it causes. A direct agent, onthe other hand, is a substance that will be completely useless for any other purpose after the chemical reaction occurs. In addition, information on the Innovative Clean Energy (ICE) Fund levy has been added to this bulletin. British Columbia recently created a $25 million Innovative Clean Energy (ICE) Fund to help support clean energy initiatives. This fund will be financed by a 0.4% levy on sales ofenergy products that went into effect on September 1, 2007. The levy applies to energy products such as electricity, natural gas, grid propane and fuel oil provided that they are not used for transportation purposes.