wrote in message
ups.com...
I have a pond with some assorted fish and a few plants. Every couple of
weeks though, the water and the walls of the pond turn green. Can
anybody tell me why and how to fix it?

Umm, what is the water and walls doing between these intervals? :-) It is
natural and actually helpful for algae to grow on the walls of your pond.
It is also natural for the water to turn green. Having said that, green
water is an indication that there is nutrient build up in your pond that
needs to be addressed. You need to give us more information, such as the
capacity of your pond, number of fish, how many plants, what kinds, water
parameters (pH, alkalinity, temperature, ammonia, nitrites, nitrates, etc),
what kind of filtration you have (and pump flow rate), how old the pond is,
etc. Give us this information and we can more accurately tell you what you
need to do. A link to a picture or two of your pond would also be helpful.