yes.i have used Ona block/gel/liquid.will it do the job of a carbon filter ? no.
as an air freshener you can smell without tasting at the same time,i rate Ona as a good thing to have.
They are great air fresheners. @archie gemmill Is correct, will not replace a carbon filter. I use mine for when I am harvesting. I put it outside of the room I trim in. With a carbon filter in there and the Ona in other room covers the smell well.
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