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 ## Filter Key Parameters to measure [[2](https://scientificfilters.com/wp-content/uploads/2016/03/BasicFiltrationConcepts.pdf)]
 - Scanning Electron Microscope [SEM](https://en.wikipedia.org/wiki/Scanning_electron_microscope): This tests characterize the materials porosity. Target: < 0.1 um. 
+        - **Update:** Camron did SEM imaging: [SEM](https://gitlab.cba.mit.edu/palomagr/wood-pulp-filter/-/blob/master/SEM.md)
 - Particle Retention Rate: "In a filtration process, the particle retention efficiency of a depth-type filter is expressed in terms of the particle size (in µm) at which a retention
 level of 98% of the total number of particles initially challenging the filter is
 obtained". Target: 95%
 - Preassure Drop: The higher the pressure drop, the harder it is to breathe. Target: <5.82 [mmH20] at a flow rate of 32 [L/min]. 
-- We are following [FDA COVID-19 Face Mask Public Health Guidelines ](https://gitlab.cba.mit.edu/palomagr/wood-pulp-filter/-/blob/master/References/COVID19-Face-Masks-Guidance.pdf)
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+We are following [FDA COVID-19 Face Mask Public Health Guidelines ](https://gitlab.cba.mit.edu/palomagr/wood-pulp-filter/-/blob/master/References/COVID19-Face-Masks-Guidance.pdf)
 
 All this tests could be replaced by a DOP ([DOP Guideline](http://www.eacoontario.com/pdf/2013/Revised%20August%2027%202013%20DOP%20PAO%20HEPA%20IntegrityTesting%20Procedure.pdf)).