I use DryStall as my pumice source. It is cheaper and easier than importing a truckload of Pumice to Texas. I am often asked about my potting ingredients. For potting most plants, my basic mix is: 1 part pumice (DryStall), 1 part sand, 1 part Turface MVP (I love this stuff, I also root cuttings in pure Turface), 1 part Diatomite (Napa Floor Dry 8822, but other Auto parts chains have their own brands of the same thing), 1 part organic (usually a locally produced cactus mix). This all goes into a cheap electric cement mixer along with a scoop of a mix of my minor ingredients which include Azomite, humic acid, bone meal, blood meal, cottonseed meal, 9 month osmocote, systemic fungicide, granular imidacloprid, inoculums, etc. It takes less than 5 minutes to make a big batch that is stored in big plastic boxes with lids. When potting I add ingredients to this base to tailor the mix for the needs of each plant. I use big metal bowls from a restaurant supply. It's like cooking, a pinch of this and that as I go. The objective of this potting "personalization" is to have a healthy collection of plants that can all be watered at the same time no matter where they are from. It takes no special knowledge about the plants to water them, my house-sitter can do it, or even my husband. If a plant is in no-water dormancy, it is moved into the garage, out of range of the hose. This system has created a surprising amount of freedom to take long worry-free vacations, and the plants are very happy and embarrassingly fecund. The PBS BX/SX is one beneficiary. m