At the object level . Permissions allowed or denied at the object level apply to the entire object. For example, you can set an object-level permission on an OU object that allows a particular group, such as Account Operators, to create child objects in the OU. At the property level .
Ball mills are used in chemistry and in industry to grind hard solids to a very fine powder. They are very similar to rock tumblers. Basically, the idea is to rotate a container filled with heavy metal balls that crush the substance that you want to grind.
Use extreme caution when using these pool chemicals and as with any pool chemicals, read and follow label instructions, warnings, and storage procedures. Calcium Hardness Increaser (Calcium Chloride). -Increases the Total Hardness of pool water. -Available in granular form, as well as a relatively new liquid form.