Prorganics Perlite 1200g bag (3 Bags of 400g each) Made in USA (Quality really matters) Now you can have the famous Perlite at fair price. If you want to give your plants the best, then Prorganics Perlite is the best choice. Keep in mind that 400g is enough perlite for more than 40 pounds of soil (if you use the correct amount of product off course). So’ 1200g is a better deal without any doubt. Pay TODAY before 12:00pm and I will ship your order TODAY! Sundays & Holidays the usps are close, so’ please be patient. Perlite have some uses but we use it for agriculture because it’s natural, it holds water for our plants and because we want to use just the best. For other products like Promix, Top Soil, Peat Moss, Seeds and more, please visit our amazon store. Here are some important information about Perlite, take a look: What is perlite? Perlite is an amorphous volcanic glass that has a relatively high water content, typically formed by the hydration of obsidian. It occurs naturally and has the unusual property of greatly expanding when heated sufficiently. It is an industrial mineral and a commercial product useful for its light weight after processing. Perlite is an excellent filter aid. It is used extensively as an alternative to diatomaceous earth. The popularity of perlite usage in this application is growing considerably worldwide. Perlite filters are fairly commonplace in filtering beer before it is bottled. Small quantities of perlite are also used in foundries, cryogenic insulation, as a lightweight aggregate in mortar (firestop) and in ceramics as a clay additive. It is also used by the explosives industry.