Membranes, Caps & Fill Solutions


Hach membranes, caps, and fill solutions are essential components for dissolved oxygen (DO) probe maintenance used in BOD and COD testing applications, with service kits containing replacement membranes, electrolyte filling solution, and cleaning cloth for maintaining accurate oxygen measurements. These components work together in Galvanic or Clark-type electrodes that use an anode and cathode in an electrolyte solution to measure dissolved oxygen, which is critical for determining the biochemical oxygen demand (BOD) and chemical oxygen demand (COD) parameters that indicate organic pollution levels in water samples.

Free Ground Shipping On Orders Over $1500!*

21 Products

Show 92
Most Popular
Newest Items
Price High to Low
Price Low to High
Name (A - Z)
Name (Z - A)