COVID-19 UPDATE: We are running backup Virtual Classes for the rest of the term. If we are able to reopen in-person classes, we will have a live stream available.
This is the charcoal 4-layer filter for the <a href="https://store.stqitoronto.com/index.php/store/viewproduct/2dFh0frFy9LZ">Active Breathing Mask</a>. It is recommended the filter is replaced after 35-40 hours of use.