i have a filter and a pump and a fountain and also i use a type of algae reducer thing (like a syrup) , also there is a shade cloth over the pond. How can i clean all the rocks that have algae on them, so far i have cleaned abit of them one by one with a sponge, can i put them in boiling water to kill the algae any suggestions??????? thankkyouu (10 points best answer)

i am not sure how deep it is but, it is large. too large to drain. It may have a natural cool water spring in the middle and estimated 35 feet deep. I ‘t has never been taken care of and i am just starting. i would like to get a fountain pump for the middle but, i need landscaping ideas, pump sizes and to clean up the water. how can i tell if there is a natural spring???

We have a little fountain (200 l) which pumps the water permanently through three stones. I have to brush the stones twice the week otherwise they get green and look terrible. Has anyone an idea how I can prevent that the stones get green?