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 live in Pennsylvania and the pond temperature will flucuate from a nice summer day to a bitterly cold winter. The pond does have a pump and fountain so the water is circulating. But the amount of algae is clogging the pump too often. Thanks for any and all advice.

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?

The fountain is in open directly under sun. It is diameter of 6 feet. Water is circulated through a immersed motor pump