I have not been able to dedicate as much time as i would have liked to my pond in the last few weeks and i am paying the price. My pond has a lot of organics in it and i believe it is fueling algael growth. Not in the water column but it is detaching and cloging the filters. I have a submersable pump that is running and not moving nearly as much water as its supposed to. I am hoping its gunked up. I want to add hydrogen peroxide and kill it off before cleaning the pond out (50% water change and taking the pump apart to try and clear the gunk). Is this an adequate plan of attack? and how much peroxide should i use? Do i need to bipass filter media?