If it matters, I'm west-coast USA.
I have this water fountain:
I'd like to clean it to remove this green stuff on it, but I don't know what it is. I'd also like to remove the white around where the water is [when it's turned on].
How should I remove it?
A hose did a decent job, but took a long time and it's still fairly green. Maybe a pressure washer? Chemicals?
The white is probably lime or calcium deposits. The green is algae.
A cleaner such as CLR or will work on the white stuff, or you can try to brush it off with a wire brush. It is a product of the minerals in the water so eventually it will come back.
There is an outdoor bleach that is safe for plants. The rocks getting wet and drying slow will regrow the algae as well.
You could look into chemicals to put into the water if it is a recyclable type of system. However there is a trade off there as well. Chlorine can cause early breakdown of soft components in the pumping system.
Bottom line is any fountain/ pond is requiring cleaning and maintenance.
