For circle casting, you can use things like salt, water, and earth, unless you specifically want to use objects to build your circle (and you can even use both!). You do not necessarily have to consecrate items within a circle for them to be deemed sacred, holy, pure, etc, however it is better to do this within a ritualized setting, as it tends to put more oomph into your cleansing and blessing. If you wish to, you can create a circle of salt, water, or earth, consecrate the items for your circle and/or altar, then use the items that you have consecrated within that circle for an inner circle or for placement on your altar (which should be within your circle if you wish to do this).
But all in all, which way you decide to do things is upon you, your path, and how you want it to be.
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