how to cool down pond in summer?

[Flaringshutter]

Also - remember that the nights in summer are quite warm, and you'll have a lot of oxygen depletion going on at night with all those plants. Putting out oxygen during the day, they won't cause any problems, but they'll be using up quite a bit at night, and with the warm water not holding much oxygen anyway, you might want to think about a fountain or waterfall to cool and aerate.

 

[snapping247]

I have a filter

I have a laguna powerflow 1000 filter, heres pics. of it

The two output nozzles are going to be puring into the pond causing alot of airasion.

 

[Waterscaper]

That filter is over kill and that is always the best way to go in my experience with ponds, with this and as many plants of as many different varieties as possible you should not need uv , I think you are going to be happy with your results, but this will undoubtedly result in your wanting a larger pond, and that can only be a good thing.

 

[Desertponder]

The 300 gallon stock tank is not going to get too hot even in full sun. At least its my experience they won't. It would probably depend on the climate you are in but I'm in the hot desert. As long as you keep the water moving and provide aeration you'll be fine.
If you wish you could put up a large umbrella to help shade it or some shade sails.

 

[Mr. U]

If you want to have your pond stay cooler during the summer, you may have to dig deeper, thus creating a bigger pond. Providing shade via landscaping could help keep the direct sunlight away from your pond. I have a friend that scrapped his pond project. He had a pre-fab pond liner that was too shallow and was out in direct sunlight. I don't know what finally did it, but it was either the algae that formed, the neighborhood cats, or the neighborhood kids, or his cutting corners and trying to do the project the cheap way. The end result was a dead pond filled with goo. I even gave him bamboo, umbrella palm, and hyacinth plants to help him - all dead.