Respirator Boost is a powerful, fast-acting supplement that supports healthy, elastic and clean airways. When is RESPIRATOR BOOST recommended? During periods of heavy dust and particles in the air. For horses with a high respiratory load. Regular or long travels. COMPETITION WAITING PERIOD SWE: 96h FEI: 0h. One pack of Respirator Boost 1L lasts for about 33 days at maintenance dose.