pond supplies

I want to go back to the ranch we've been last 2007. It is just an hour away from the city and the ranch owned by my husband's friend's daughter now and it has a pond in the middle. The pond serves as the source of water to drink for their few animals in the ranch. I have seen the view and I thought it was pretty down there.

I think in order to keep a pond alive, you should have all the pond supplies need to keep the water clean for the animals. I think they put something in that pond because the water itself looks so clear and green despite of the dark cloudy sky and the grass surrounding it wasn't green anymore as it was during mid Fall when we visited the ranch.