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.
Dido and the other Pygmalion. The romantic legend of the founding of Carthage is that a merchant-prince or king of Tyre gave his daughter Elissa (usually called Dido in Vergil's in marriage to his brother, her uncle, a priest of Melqart named Sichaeus, along with the kingdom.