Ok, so I have fished most of the algae mats out and now have a light "film" of something over most of the pond. Rakes and nets are not removing it but it does interfere with lures when I try to fish (or practice fishing).

What is it and how can I adjust pond the pond to correct? Currently the only aeration I have is rain, runoff and a spring. No electricity close so any mechanical assistance would have to be wind or solar powered.