The moisture inside the BCD or a buoy creates perfect conditions for the development of different types of microorganisms, including fungi and pathogenic bacteria.
By removing water from the BCD after the dive, like it or not you form some aerosol which is filled with numerous bacteria. And from there it is very easy for them to get to your lungs and sinus.
Many divers have already experienced how bothersome it is, when chronic problems with upper airways deprived them of diving for many long months.
In order to reduce the risk, the inner shell in all XDEEP buoyancy compensators and SMBs contains special agent preventing the development of bacteria and fungi. The agent, safe for people, permanently adheres to the shell, so it does not rinse off and protects your dive gear during the entire period of use.