liquid harvest surfactant for herbicides non-ionic 8oz, increase product coverage, increase product penetration, increase product effectiveness liquid harvest get the best results from your herbicides, fungicides, and algaecides by using a surfactant. surfactants help stick your chemical herbicides, fungicides, and algaecides to the plant. this product will also break down the waxy coating on weeds to allow more effective penetration of weed killers. liquid harvest surfactant is available in three sizes: 8 oz, 16oz, and quart. liquid harvest works great with lawn and garden chemicals like herbicides, fungicides, and algaecides.