The ProTech 300 Boiler Water Treatment by Alternative Heating & Supplies Has been designed to be used in Manufacturers boiler treatment programs. These programs insist the wood boiler owners meet certain nitrite levels in order to comply with warranty requirements in regards to boiler corrosion prot...

1. Filter 9-17292 is designed for use with liquids and wet debris only........2. Not to be used for dry debris.......3.To maintain filter performance,rinse thoroughly with water after each use.....4.this filter fits most 5 gallon and larger vacs made 1988 and after.... Filter No.9-17292 fits 6,8,9,1...