Sulfuric Acid only. To be used with water test kits p/n 405 and p/n 597.
Complete kits include pH test strips. It's a good idea to check your water atleast 3 times a year. The water in your outdoor wood furnace/boiler is the lifeblood of the system. If left unchecked, untreated water can clog expensive heat exchangers and corrode the boiler from the inside out. Be sure to pickup some Corrosion Inhibitor (p/n 1650).
*This product cannot be sentåÊthrough US Mail and must be shipped UPS.