I like using barley pads in my pond and filters. But most of the stores I go to have small pads. So I bought a pound of barley seeds, the place that sells them have them for sale to grow for use in koi ponds. I planted half the bag and they started growing quick. You wait until the barley matures at around 50-60 days cut the barley down to the grown so it will regrow. Bag it up. I use large filter bags. Works great.