Question:
Can Caesarstone countertops be kashered for Pesach?
Answer:
It is a controversial issue, some poskim say that it can not be kashered because it is partially made of synthetic materials (7%), while others permit it. I don't know enough about this to answer you, but here are a few links.
https://www.star-k.org/articles/articles/kosher-appliances/2039/countertop-pre-purchase-advice/
https://oukosher.org/halacha-yomis/can-i-kasher-my-quartz-stone-aggregate-countertops-for-pesach/
https://dinonline.org/2016/05/16/kashering-formica-counter-top/
Have a chag kasher vsameach
