Feeder Fresh works best when placed in the wettest part of your feeder, or the part that spoils the most frequently. Usually, this is the very bottom of the feeder.
It can also be layered or blended with the seed. When layering, do about an inch of Feeder Fresh every few inches. When blending, mix throughly into seed before adding to the feeder.
Feeder Fresh is non-toxic and safe for bird consumption. Wild birds are likely to pick through it and eat the seeds around the Feeder Fresh, but if they do ingest any it shouldn't do them any harm.