An altar is a physical focus for magic and spirituality. It provides a place to work and worship. There is a distinction between things that change with each spell or ritual (such as stones to symbolize current astrological energies) and things that stay the same ( like an offering bowl or incense burner). Other things such as divine icons or altar cloths may or may not change.
Here is a spell to bless the permanent tools on your altar. You will need your altar, your permanent tools, incense, sea salt, and a bowl of water.
First take everything off your altar and clean the top. Safely light the incense and sprinkle sea salt in the water. Invoke your patron deity(s). One at a time, place your permanent tools on the altar, each in its accustomed place. Hold each tool and say:
God/dess, bless this solid symbol of
Waft incense smoke over the tool and sprinkle it with the salted water. Then place it on the altar.