What is the usual life of PL-0082 optical sensor in seawater used in the sump for ATO?
Mine begins their second year and I was surprised today an optical sensor stops working ...
It constantly indicates the presence of water. if I light it with a lamp indicates a lack of water, so, the problem does not come from the cable because the sensor is still able to change state. But it no longer works correctly ... This kind of sensor is to be replaced each year?

Thank you in advance.