Well I feel rather vindicated... I said the algae problem is likely related to nutrient excess in the water

[LeftInTX]

35. I had a pool. Algae was 24/7. No ducks. But pollen was likely source.

Algae was always worse after pollen events. Also rain events were notorious for dropping dirty plant material in the pool. Once again, more algae.

That pool will always have algae unless they turn into the Bellagio fountains.

The lake contains 22 million gallons of water.[55] It is partly filled with well water, which was previously used for the Dunes golf course. The lake uses two-thirds of the water previously used for the course.[56] Water from the resort's aquatic show, O, also drains into the lake.[57]

Approximately 12 million gallons are used each year for the fountain shows,[55] and the lake uses roughly 500 pounds of chlorine per day.[54] Several restaurants at the Bellagio resort are situated to overlook the lake.[58] The water temperature ranges from 50 degrees in the winter to 85 degrees in the summer.[39] It is frequented by ducks,[36][39] some of which have made it their permanent home.[59]

The operating and maintenance team works in a hidden cavern known as the Batcave,[39][36][20] located within a fake rock formation beside the lake. The Batcave contains four equipment rooms.[8][25][34] The team consists of 30 people, including computer technicians, electricians, and welders. Due to the amount of time spent in the water, all team members are trained scuba divers.[54][36][25]https://en.wikipedia.org/wiki/Fountains_of_Bellagio