The pond in my backyard gets a lot of algae in the summer. I was reading on the web about constructing these floating islands where you plant water loving bog plants to remove the nutrients from the pond to help with the water quality. There are a few youtube videos of people constructing them out of a pvc frame with a vinyl 1/2 inch mesh on the bottom. They fill the frame with soil and the plants, and the plants roots grow through the mesh into the lake and remove the nutrients from the water. I was wondering if anyone has any experience constructing these islands and their thoughts on what materials work best. Another video shows them using black drainage piping and filling it with empty water bottles to make the frame. I hope to make 3 islands 4 X 8 foot long this spring. They sell the islands commercially, but they are very expensive. I will need a lot of plants and if anyone knows where I can find any bog plants like pickerel weed, blue flag iris, or canna lilys I can dig up and transplant would be appreciated. I read that the canna lilys are the best for removing the most nutrients from the water. I thought about just using water hyathins instead of the islands, but I read they can take over your pond real quick and are hard to eradicate once you have them.