For air pollution application, we recommend changing the filters after a maximum duration of two weeks, or when the filter discolours from white to mid-grey (refer to the picture on the packaging).
For application against the viruses, maximum duration of one week for normal use in low-risk areas such as shopping mall, office and public transport. However, the filters should be changed immediately after using it in high-risk areas such as crowded hospital or clinic.
The Totobobo mask has some differences to a typical (NIOSH) N95 mask. There are pros and cons.
A published peer reviewed study by the Prince of Wales Hospital shows Totobobo mask is able to fit more (70%) people than N95 mask (40%) which is important for providing effective protection. However, when the mask is well fitted, N95 mask provides a higher level of protection than Totobobo (scoring 193 vs 133, where 100 is the passing mark).
Totobobo mask comes in two sizes, Large and Medium/small.
Large size is suitable for most man.
Medium/small is the same mask and is suitable for most women directrly. For children, the same mask can be trimmed to a smaller size.
You can use the Size chart for a quick check: If you need more accurate size estimation, please download and print this template to make a simple paper dummy mask. That allows you to check and compare the two sizes physically.
Totobobo mask does not interfere with spectacles (glasses), because it is very thin and lightweight and it can follow the nose profile closely.
Many users have been using their Totobobo mask for 2 years or longer on a regular basis. This easily translates to 600 times of uses. If the mask is well maintained, some users reported using the same mask for 5 years+.
TOTOBOBO mask contains Silver ion, an anti-virus agent. This active agent limits the growth and slowly kills the bacteria or viruses chance on its surface. For non-contagious situations, it is safe to reuse the mask after 24 hours of leaving it in a clean environment. However in a situation that the mask may be contaminated with contagious viruses or bacteria, or when using it in critical areas such as a clinic, it is necessary to disinfect the mask before it can be reused. In any case, sweat and grease from our face will degrade the plastic mask over time, therefore it is better to wipe clean the mask after each use.
The mask can be disinfected by washing it with soap and rinse with water, (like washing your hands). It can also be disinfected with alcohol wipes.
Furthermore, if replacement filter is difficult to get, the filters can be disinfected with UV-C light to extend its useful life.
More details here