The media is chosen for your tile, not for us.
Glass bead, soda, or something gentler. What goes in the pot depends on what it is hitting, and sand never touches glazed tile.
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Blasting is how scale comes off without acid and without draining. The variable that matters is the medium: too aggressive and it hazes a glaze, too soft and it will not touch silicate.
Soda is the gentle end and rinses away. Glass bead cuts harder for stubborn carbonate. Natural stone, glass tile and glazed ceramic each take a different answer, which is why Paul looks before he quotes.
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