 [ Symptoms ] if i am allergic to coconut will i react to air or water filters made from coconut shell based activated charcoal [ Disease ] probably not i assume you are referring to a food allergy to coconut the food part of the coconut is of course the white fleshy part of the fruit the filters you refer to are made from the fibrous outer shell of the coconut because you will not be ingesting eating this you probably will not feel any ill effects from breathing air filtered through coconut fiber you also probably will not notice any effects from drinking water filtered through this fiber however if you suffer an anaphylactic reaction to coconut then i would not advise drinking water filtered through coconut fiber while i believe it is unlikely you would have an adverse reaction you do not want to take that chance for more accurate information consult an allergist that is your best bet hope this helps