Barley straw cleans ponds and it's safe for fish.It's also safe for livestock. We use barley straw bags in our horse tanks. As long as you change them regularly (see the label on yours for info), they work great!
An overview of the interior of our garden. The stock tank water feature is a strong focal point that draws attention from within the house as well as the garden. The strong geometry is softened by layered, thick plantings. See more photos of our garden at