How to perform a seal check with the water mark method?

The protection of a respiratory mask depends on two factors:
1. How good is the air filter and
2. How well the mask is able to seal your face, such that the air you breathe in must go through the filters.

The filters can be tested by reputable laboratory where certified reports are produced. We sent filters to Nelson Labs in USA and the results are published.
However, it is not at all easy for individual user to determine if the mask is really fitting the face completely without any gaps. Totobobo is the only mask in the market provides a simple method, or the “Water Mark check”, to let users ensure the face seal.

Water mark shows poor and good seal before and after ReShape of Totobobo mask.
Water mark shows poor and good seal before and after ReShape of Totobobo mask.

The frost edge of the mask changes to transparent when it touches wet skin. This is called the “water mark”. Followings show a step by step approach to check the seal with the water mark:
– Apply a thin layer of water on the user’s face with cotton wool, especially around the nose bridge and chin area.
– Don the mask and carefully examine the water mark.
– Check if the water mark form a complete, continuous loop encircling the nose, mouth and under the chin, that indicates the mask is making a good seal around your face. The mask is now ready for use.
– If there are patch(s) of frost area breaking up the water-mark-loop, that indicates where the seal breaks and you may need to adjust the mask to improve the seal. There are several things you can do, such as:
1) Adjust the position of the mask. (shift it up and down to find the optimal position)
2) Adjust the tension of the elastic straps (it should be firm, but not too tight)
3) ReShape the mask (use 70°C water or hair dryer, but don’t overheat!)
4) Cut the mask smaller (only when it is really necessary!)

Your mask is ready to give you the best protection when you have a good seal. Do use the water mark method to double check the seal.