A200 Boiler Treatment - Has been specifically designed for outdoor and indoor wood boilers with mild or stainless steel construction. This product may also be used as a full spectrum water conditioning agent for other hydronic and solar heating applications. A200 is the only environmentally friendly boiler treatment. One quart treats 200 gallons. TK500 Test Kit - Has been designed to provide an easy and accurate means to determine the level or amount of A200 boiler treatment in outdoor wood boiler system. You will be able to answer the question: Is my boiler treatment working? Most of us spent a lot of money for our wood boiler stoves. These products are better quality & price than what the OEM's are trying to sell you! ....read more