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.
HEPHAISTOS was the Olympian god of fire, smiths, craftsmen, metalworking and stonemasonry. This page describes the arms and armour crafted by Hephaistos for the kings and heroes of myth. The most famous of these artifacts were the armours of Herakles and Akhilleus (Achilles). The first Works page describes other creations of the god including palaces, animated statues, chariots, jewellery, cups and bowls.