First, get your nose in the game. Pour a fresh glass and give it a good sniff. If it smells like a swimming pool on a hot day, that's chlorine doing its job, but maybe overdoing it.
A rotten-egg odor? That's hydrogen sulfide, and it's nature's way of saying, "Please call a plumber, buddy." Your nose is basically your first line of defense—trust it like you trust a dog that barks at the mailman.
