I have an Autotrol 255 mounted on a tank to neturalize acid. Recently the company that was servicing the system went out of business. I need to know how to disassemble the unit to add Calcite to the tank. I have a manual that came with the unit but it is not the 255 unit.
This unit does not seem to have the 'u' or 'c' pin that the series 155 does. Please advise.