Orbeco-Hellige Instruments for Water Analysis, Reagents and Parts. For over 80 years, Orbeco-Helligehas been a leader in the design, production and global marketing of water and wastewater testing. Offering a full range of instruments, reagents and accessories for testing over 100 parameters covering a broad range of applications from drinking water and wastewater, to swimming pools and spas. Orbeco-Hellige reagents are available for a wide variety of parameters and are available in tablet, liquid and Powder Pack™ formats. The Powder Pack™ Reagents are pre-measured, single dose reagents, that have been specifically formulated to be direct replacements for Hach® reagents and can be used on Orbeco-Hellige instruments as well as on theirs.