Triple Cleaning

Every surface is cleaned unidirectionally with overlapping strokes, never back and forth. We work top down: ceilings first, without contacting HEPA filters, then walls and vertical surfaces from top to bottom. Flat surfaces and floors are cleaned last, starting at the point furthest from the exit and working toward it, so no cleaned area is crossed again.

Why three passes

We perform Triple Cleaning in rooms classified ISO 5 through ISO 8. Across that range the tolerance narrows sharply: an ISO 8 room is allowed 3,520,000 particles per cubic meter at 0.5 microns and larger, while an ISO 5 room is allowed 3,520. The tighter the class, the less room there is for anything left behind.

Particles that have settled on ceilings, walls and equipment do not stay there. Air movement, door swings and personnel put them back into suspension, where the particle counter reads them.

Three sequential passes use agents with different modes of action rather than three applications of the same one. Regulatory guidance expects a disinfection program to include a sporicidal agent, and EU Annex 1 calls for more than one type of agent so that their combined action covers a broader range of organisms. The specific agents and their order follow your SOP: commonly two sporicides plus a third agent such as 70% IPA, though what your documentation specifies is what we use.

Where it fits in certification

Certification measures how the room performs: airborne particle counts, HEPA filter integrity, airflow, pressure differentials and recovery. It does not grade the cleaning. What it does require is that the room be brought to an agreed, controlled condition before testing begins.

That condition is what we deliver. We clean ceilings without contacting HEPA filters because filter integrity is tested separately, by aerosol challenge and photometer scan, and a filter disturbed during cleaning fails that test regardless of how clean the air reads.