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.
Didymo (Didymosphenia geminata) is a freshwater colonial diatom originally found at high latitudes in the northern hemisphere including the British Isles and Europe, where blooms historically occurred, and North America where records before the 1990s are much-less common and blooms were not reported (Spaulding and Elwell, 2007; Blanco and Ector, ...