Well, the only thing I can add to this is that ALL of the commercial operations use some sort of foam and to my knowledge, none of them have been sued over it. I have been researching this alot in all different countries and I have not come across anybody using anything different no matter what type of system (hydropoinics or aquaponics) or applications (home farm or commercial) anywhere I look. In the end if you can find a substitue go for it and let us know how it works, if not you have to be the one to decide if its right for you. Wish I had a better answer for you.
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