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I have played terraria for a while now but I have noticed that my corruption biome is spreading into my desert and I’m not sure if this is a good thing or a really bad thing. My question is how do I stop the spread of corruption easily for above and below ground? (for hardmode) Also all I know is that corruption spreads “3-6 blocks per day” is this irl? And does it spread faster or slower through sand?

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According to the unofficial Terraria wiki,

The player can remove corrupt areas by using Purification Powder

The Clentaminator can [also] be used (with purchased solutions) to change blocks into the normal pure forest, the Hallow, the Crimson, or the Corruption.

Wood is a cheap but effective material for containing the Corruption or the Hallow.

Also see the the official Terraria wiki:

Purification Powder is able to revert any Corrupted … Blocks back into their pure form

Bonus option — Air works, too!

By digging at least a 3-block wide tunnel around your corruption/crimson/hallow, you can prevent it from spreading outside of the boundaries that you give it.

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