How do I keep my pond clean, growth and algae free.

Maybe try some anti algae for swimming pools?

Do you have fish, snails, frogs in your pond? Please don't use swimming pool chemicals in ponds since they have different purposes. If you don't have fish or snails, you might consider getting some, being careful not to get intrusive species; both will help keep the pond cleaner. If you don't have a pond filter, I'd recommend you get one. Do you have a fountain or a burbler to help freshen the water? You may want to check with a nursery or a pond specialist regarding what you need to have a healthy pond. Lastly, I'd suggest having a floating plant cover (no more than 30-percent of the pond's surface): lilypads, for example. Once you get the pond situated, there's very little work required other than typical seasonal chores.

Copper Sulfate. It is used to eradicate weeds in lakes but check its toxicity to aqua life. Algae thrives with these conditions: stagnant water--you'll need some kind of pump or aerator; too high a water temperature--is it very deep?--and too much phosphates from nearby water run-off or nitrogen from the pond's vegetation that feeds the algae. You may need to invest in a 'water rake' and skim off the algae weekly. Note: You can use the dried algae as fertilizer in your garden.

You can get inexpensive "doughnuts" from garden supply or hardware sores. Safe for fish if you have them.

in the spring you can throw a bale of barley hay in the bottom...get it at your extension service.

dont START with chemicals..do some research. You can get a bubbler that's solar for about $30...

.i have a neighbor that had the same problem but he wanted to be able to swim in his pond. he found that if you contact the enviroment people that there is a type of fish .it is called somekind of shark .this is a very safe fish dont let the name scare you we live in ny state. but you have to have permission to have them. that is why you need to go to the enviremental people. they figure everything out for you. he has a very large pond and needed only a couple of them. it worked beautifully. sorry i can not be more specific. all i know is that it worked when nothing else did. best of luck