Roseman I use the exact same method for the past few grows. The only thing I can really say is Honestly it is very temporary.
And I only have a few going at a time. I had to keep adding Ona every week. And Dude my girl stays pissed.
I keep telling myself it works, cause when Im in the room I smell clean.
She walks in the house and smells Ganja.
She can distinguish the smells apart.
Lately I have been moping the floor every other day
with Faboluso. That covers it up very good in addition to the Ona block.
I even added the Moisture pellets to prolong the cleanness.
Im going to do a carbon filter. I have no choice in the matter anymore.
I like the Tut. Very same design I used.
Again like I said for me, it's a cheap temporary fix.
I think It works well when you have company over
you can blast the room with a cup of fresh ona
But, Not a end all, be all of odor control.
But just a another step in odor security
~~Joe~~