boiling or baking both work to clean perlite. it doesnt really harbour anything though so rinsing well is usally enough when its new and unused. Perlite that has been most though i would prefer to boil it.
Miracle grow perlite is fine, just make sure to rinse it extra well as it tends to grow algea
Miracle grow perlite is fine, just make sure to rinse it extra well as it tends to grow algea