Thank you for the info. We plan to do a survey of the flood gates that we are trying to galvanically protect.
Periodic cleaning of the anodes is not practical though. This would require heavy lifting equipment and significant manpower. I think a better alternative would be to go with a...
Zinc hull type anodes galvanically protecting low carbon steel (A588, CorTen Steel). 15 yrs in service and no noticable section loss of anodes. Anodes have developed a tough, chalky scale. This scale acts as a resistor in the galvanic circuit.
Water Analysis: pH=7, conductance=135umhos...
