I had snails in the pot with my turmeric. I threw the infested plants away but left the soil as I have ginger sprouting in the same pot.
Do I have to throw the soil out?
No - just treat for snails; snails and slugs are always with us, everywhere, more noticeably in damp weather, so regular applications of slug and snail repellents are usual. Snails are easier to deal with, you can pick them off by their shells anyway.