Algae is a part of all healthy living aquatic ecosystems. There are hundreds of different species and they all play a role in the complex web of life. All healthy aquatic ecosystems have algae in some form or another. Some species can be very beautiful. All marine plants are multicellular algae (kelp for example). The only swimming pond we have ever seen that did not contain any algae at all was poisoned with chemicals. It looked a bit weird.
Controlling water chemistry and the balance of nutrients through precise biological engineering will have a direct influence on the species composition of the algae in the ecosystem. With the correct planting and biological design, species composition can be shifted toward species that are less vigorous and more appealing to the eye.
One of our dreams is to create a pool that is completely filtered with different attractive algal species - just to be different.