Averages are for Corvallis Municipal, which is 5 miles from Corvallis.
Warnings. Do not use pumice stones to clean marble, laminate, plastic or fiberglass toilets; doing so will result in permanent scratches. A dry pumice stone will also scratch porcelain, so be sure to keep the stone and the toilet surface wet at all times.lean With a Pumice Stone. Before cleaning a porcelain toilet with a pumice stone, you must thoroughly wet both the stone and the surface to be cleaned and keep the stone and the surface wet as you work.
Pumice is a volcanic ash which is formed when lava is permeated with gas bubbles during the solidification process. Because lava has similar properties and chemical make-up as glass, pumice is very abrasive but unlike glass, it is very soft. Pumice is the softest abrasive media in use today. All Natural.ountry of Origin: United States. Pumice powder is made from pumice, a kind of igneous rock that is formed when a volcano erupts. Pumice is abrasive, which is where much of pumice powder's usefulness comes from. Cement. Pumice powder is used as an additive in cement.