701—230.9 (423) Chemical compounds used to treat water. Chemical compounds placed in water which is ultimately sold at retail should be purchased exempt from the tax. The chemical compounds become an integral part of property sold at retail. Chemical compounds placed in water which is directly used in processing are exempt from the tax, even if the water is consumed by the processor and not sold at retail.
Chemical compounds which are used to treat water that is not sold at retail or which are not used directly in processing shall be subject to tax. An example would be chlorine or other chemicals used to treat water for a swimming pool.
Special boiler compounds used by processors when live steam is injected into the mash or substance, whereby the steam liquefies and becomes an integral part of the product intended to be sold at retail and also becomes a part of the finished product, shall be exempt from tax.
This rule is intended to implement Iowa Code section 423.3(50).