Try turning it the correct way.
slide a steel pipe over the handle of the deep well socket wrench and push and turn [its call using a breaker bar] my hubby does this and it works
Sometimes hard to get off, usually a good impact makes it easier but if that's not an option get a good socket, a strong breaker bar and a snipe for extra leverage.
Ceramic glazes each have a temperature range that they should be fired to. If the glazes are fired at too low a temperature, the glaze will not mature. If the temperature goes too high, the glaze will become too melted and run off the surface of the pottery. For success, a potter must know their glazes' temperature ranges at which they become mature. When potters talk about ceramic firing ranges, they are usually referring to the three most common: low-fire, mid-range, and high-fire ranges. In regards to glazes, we need to add two other ranges: very low-fire, and lower mid-range firing ranges. Very Low-Fire from cone 022 (approx. 1112?F - 605?C) to cone 013 (approx. 1566?F - 850?C) This range is usually used for luster glazes and very low-firing overglazes. Ware must be fired at least once at a higher temperature first, in order for the clay body to mature. The ware will often not only go through a bisque firing, but also a higher temperature glaze firing. Very low-fired overglazes and lusters are then applied to the already fired primary glaze. The ware is returned to the kiln for a very low temperature firing in order to fuse the overglazes.