Once you've hauled it all out and left it a couple of days on the pond edge, you can put the algae on your compost heap (if you have one) or your council green-waste bin. I don't use barley straw, though some people swear by it. I find that once I get rid of what's built up over winter and start using my solar pump again, the algae is kept to a minumum but it helps that I have a lot of oxygenating plants in the water and much of the surface is covered in floating plants. If it's not a wildlife pond, I've been told that grass carp keep the green stuff down but you'd have to ask an expert about them. Hope this helps