Introducing The X-CID Cycle

This decontamination process consists of four phases. 

1. Preparation. 2. Diffusion. 3. Contact. 4. Ventilating

1. Preperation

Some facilities such as laboratories, cleanrooms, food packaging or reparation areas will require verification of the decontamination process which entails the positioning of the chemically reactive indicator strips at several positions in the area to be treated will allow the operator to verify that the VHP vapour has reached all areas within the room. The indicator strips will react with the VHP vapour and will change colour accordingly.
Several test areas, on a variety of surfaces, should be selected in the room. Using the supplied sterile test kits (optional purchase), swabs of these positions should be taken prior to VHP treatment and again post treatment. This will allow testing of the samples by an independent laboratory to provide an accurate and certified measurement of the reduction of the biological burden in the area. As required by some clients we carry out testing of the samples within 24 hours of the treatment process and again after seven days to ensure that no microbial regrowth has occurred.

These test processes are not normally required for areas which do not require certification.

Other preparatory actions include the sealing of ventilation ducts (or switching off ventilation systems where its possible to isolate the relevant areas), sealing of fridge and freezer doors and condensate drainpipes ( to avoid any contamination of samples being stored), covering smoke and fire alarms etc.

All of these and other related topics are covered in our comprehensive training course.

Diffusion & Contact Time

2. Diffusion

This is the amount of time required for the equipment to fill the room with the vaporised X-CID dry mist.

This is based on the volume of the room and whether you have opted for a 3ml/m3, 6ml/m3 or 8ml/m3 treatment.


EXAMPLE: A room of 30m3 volume will require 10 minutes of diffusion time if treated at 6ml/m3.

3. Contact

Once the chemical has completed the diffusion process it requires a contact time of 15 minutes at 6ml/m3 or 1 hour at 3ml/m3 concentrations. This is the amount of time which the vaporised X-CID solution requires to ensure an effective microbial kill.


EXAMPLE: Our sample 30m3 area treated at 6ml/m3 will require only 15 minutes of contact time to achieve a 6 log microbial kill count, that is an effective 99.999984% elimination of microorganisms in the area.

4. Venting

Once the X-CID solution has had the required contact time the final stage of the treatment process is to return the room to its normal state.

This requires the venting or purging of the Vaporised Hydrogen Peroxide (VHP) laden air so that the VHP levels are reduced to 1 PPM (part per million).

There are two methods by which this can be achieved.


Neutral Ventilation

The vaporised X-CID solution will naturally breakdown into two harmless natural occurring agents, oxygen and water. The completed treatment process leaves no residue. Once one enters the room after the levels have reduced one will notice a trace of vinegar in the air after solution breaks down which quickly dissipates.

It is advised that the room ventilation system is turned off during the Diffusion and Contact phases of the fogging process. Once the contact time has elapsed then the room ventilation system can be switched back on to rapidly ventilate the area. This has the added benefit of exhausting any remaining Vaporised Hydrogen Peroxide from the air via the ventilation ducts, any microbial hazards present in the ventilation duct will then be neutralised by contact with the VHP.


Chemical Adsorption System for faster and secure HPV Venting Process

This involves the use of our eCHEMOX Sentinel or CUBAIR units to rapidly purge the air of the X_CID VHP. These units quickly remove the biocide dry fog diffused during HPV process and accelerate making the treated room available again. 

This is achieved by cycling the air though the units activated carbon filters to rapidly adsorb the VHP molecules and to return clean air to the room. Both units can communicate with the RHEA diffusion units so that the venting process can automatically begin once the required contact time period has elapsed.

EXAMPLE: To return to a 30m3 sample room, the following are the approximate venting times for each option: