I do, and here's how I do it. I take the old potting soil, put it in a 3 gallon pot, and pour a kettle of boiling water through to kill it, then I mix it half and half with new potting soil. Things grow very well in this, and I've never had any root rot problems from the old soil.
Didymo (Didymosphenia geminata), also known as rock snot, is a non-native invasive microscopic algae (diatom) that can produce large amounts of stalk material to form thick brown mats on stream bottoms.
See More Ino Pictures >. Ino was a queen of Thebes in Greek mythology, the daughter of Cadmus and Harmonia. She was the second wife of King Athamas, with whom she had two children, Learches and Melicertes. Her sisters were Agave, Autonoe, and Semele, who was the mother of the god Dionysus. Ino hated Athamas' children from his first marriage with the goddess Nephele, especially the twins Phrixus and Helle.