Thanks for quick response. Average depth probably around 4-5 feet. I've tried different types of dye. I'm currently using Pond Logic Nature's blue, and I've used aquashade in the past.I'm applying it every few months or so. There were known nutrients of cow manure getting in pond in past but nothing in last year or more. I had a similar algae bloom last year but thought I would be in better shape this year with upgraded areation and beneficial bacteria but no change at all. I'd love to have a water test done...where do I send it? If i had a product that could bind the nutrients I think that might do it. I don't have a constant flow that I'm aware of. I'm not even worrying about the Sago pondweed right now because the Filamentous algae is out of control so bad that It's literally smothering the pond weed out!