White Powdery Buildup on Water Heater Supply Pipe
I've just noticed a white powdery buildup on the valve fittings on the water supply pipe to my water heater (please see image). There are two affected areas (one quarter sized, the other dime sized) and the buildup looks like what one might see on a corroded battery. Should I be dialing the plumber's number or just brush the substance off and take the wait-and-see approach?
Thanks very much for any help!