/diy/ - Do It Yourself

I've built a filter for my pond. My pump is in the pond its 1900 GPH. It goes into the filter (rubbermaid container) on 1&1/2 inch pipe. I have a 2'' outflow. The idea was the filter would actually sit in the pond. So when I start it up it comes out the outflow and over the entire top of the container. Thus bypassing all filter media. I added an extra piece of two foot pipe and raised it up outside the pond. This height and length difference and removal of a water level pipe inside was enough difference that it worked as you see in the picture. I dont trust it to run like this for fear it would drain my entire pond quickly. So I dont know if I should add a second outflow. Or just replace current outflow with a larger pipe. I don't know how to calculate the size of the output pipe.

Also if there is a way to run from the outflow and vertically up above pond water level to a UV filter outside of the pond that is what I would ultimately like.