I'm trying to picture your set up. Is the black algae just on the waterfall rocks, or elsewhere as well? What is the source of the water for the sprayer, and is it pumped? If it's only a light spray the sprayed water will only stay around the surface. the oxygenating effect won't be much different to what normally happens on the surface between the atmosphere and the pond water. Water falling from a higher placed tube goes down deeper and carries air bubbles with it. It also causes eddies through the pond distributing the oxygen further. It's all a matter of degrees, the force of the spray versus the volume and height the tube drops the water.

Hi tropicbreezent! The black algae was just on the rocks. The water comes from a well, which has lots of iron in it. The tube/hose that I have stuck between those rocks on my small "waterfall" is about a foot above the surface of the water. I was thinking that if I could turn it into a spray, more of the water in the spray would grab oxygen, but I think you're saying it would probably not do much more, and in fact, go less deep into the water? Hmmm......I hadn't thought about that. Since you asked about where all the black algae had been, I'm guessing that you'll say it's okay there, as long as it's not in the water. (And maybe it might even be good for the water?) But then again........the water trickling down the small waterfall wouldn't go as deep down into the water with it's oxygen, right? Yeah, I guess it's a balancing act! I appreciate your input!

I'd show you a pic of it, but it's too ugly. haha Maybe in the summer.............

Yes, it's a volume/velocity issue with the water. Of course I believe well water has negligible oxygen so the start point is likely zero. Maybe if you start with a sprayer over a shallow container that drains off and drops from a height into the pond. That would maximise oxygenisation of your pond.

The problem with mineralised (well) water is that it can clog up sprayers. Need to keep checking to make sure they're clear.

That species of algae tends to only coat solid surfaces and doesn't float freely. But (there's always a 'but') I've seen the same or similar algae that got on the bottom. Photosynthesis on sunny days would produce enough gas that blobs of the algae would float up to the surface. Now that looks really gross. This tends to happen more in shallower water.

I have a very large pot instead of a rocked waerfall for the pumped water to flow out of. It is set at an angle. I also use a fountain pump with the nozzel adaptors from the big box store in a smaller pond. It is wrapped in black tulle to filter out the debris that would clog the pump and I have to unwrap and clean the tulle every 2 or 3 months as the water pressure decreases. The little pump is in a black flower pot with rocks wedged to hold it in place and this is sitting in another large black plastic flower pot filed with gravel. (This is to elevate the fountain head.) There are several types of spray heads in the kit.

Because the pots are black they do not show up in the pond and the water sprinkles further keep the set up from looking bad. I also use plastic milk crates to elevate things in the pond. One crate has a very large flat rock on top for the toads and frogs to sit on.

I hope one of these solutions can help you. Ponds are so relaxing and interesting. I hope to remove the airstone that is used during the winter and turn the pump on next week and add the plants that are wintered over in the sunroom. Instant pond!

Thanks frankielynnsie.......you have good ideas! Any way you could post some pictures? Thanks!