Pond Foam Separator/Protein Skimmer by Bubblemac Industries, Inc.

Use on over crowded koi pond...to many big fish and growing. Protein skimmer has lessened the biological load on my filtration system and resulted in a decrease in the need for water changes. Happy Fish, Happy Owner

I've had this thing running for days with an air pump slightly more cfm than recommended and it still has not produced one iota of foam. Meanwhile, there is foam in my skimmer.