Adding coral/shells from beach?

Why would you need to boil a coral skeleton when people collect live sand and coral from the ocean?

<- Confused.



There is polution. The only safe way to collect sand from the ocean is to go out miles and say 50 feet down to collect sand. Anything near a beach or shore carries the risk of pollution,bacteria etc.

Anything collected near a beach should be boiled.
 
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