As I explained at CEM:
My own personal theory is that its the methylcellulose used in the Finaplix as a binder/filler that gives you the fina cough.
Filtering does not get rid of all of it. Some of it seeps through into the final solution.
Its not dangerous, but I'm willing to bet its what causes the cough.
What clued me in, is when I baked my Fina one time, I noticed that there was a "brownish" substance that had adhered itself to the bottom of the vial.
Anyways, to make a long story short, I didn't bake my Fina my first time(Just filtered it with a .22) and i got a cough almost every time I injected the Fina.
After reading about methylcellulose, I started baking my Fina, and I almost always got the same "brownish" substance adhered to the bottom of the vial.
I then transfered the Solution from the vial with the oxidized methycellulose to a sterile vial, and I didn't get any fina cough after injecting.
After that, I always baked my Fina. Never have had fina cough since.
It also IMO, makes the final solution more sterile(baking it), but thats just my opinion. Some people disagree with this.
It makes sense from a bio-chemical standpoint.
Fonz