How do you keep algae out of your out door pond or at least keep it down some?

The sun is hits the pond and there are some trees (pine)
Answers:
One of the best methods to control algae is the use of floating plants in the pond. They both shade the water and use nutrients from the water. Things like water lettuce or water lilies that ffer shade are both good.

MM

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You need to by the fish that eats algae...

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cat fish.

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what i would do is clean it out put more water in there is this thing at the pet store is called be gone it works on ever nature water system

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By an algae killer product, and a pocostimus fish, they eat algae.
I'm havin' the same problem myself, and this is working pretty well.

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To add to the other ideas you've gotten, is the algae attached to the sides, or is this free-floating algae in the water? If it's free-floating, a UV sterilizer unit will help, but these are expensive and the bulbs need to be replaced at least once a year.

If your algae is attached, a UV unit won't do as much good, so you may need to try and remove as much as you can by hand.

If any needles from the pines (or any other trees or plants) get in your water, remove them as soon as you notice them - these will eventually decompose and add to the nutrients that "fertilize" the algae. You can also do 25% water changes to reduce any nutrients from already decaying leaves, fish food %26 poop (if you've got fish in the pond), and pond plant fertilizers (if you use them).

Once you've removed any attached algae, add a bale or so of barley straw. It doesn't affect algae already present, but it prevents new algae. See info on this: http://montgomery.extension.psu.edu/nres...