Water Gardening: Raised pond built with cut stones, 1 by FrillyLily

FrillyLily wrote:
Ok It has been months since I posted on my pond progress. I have posted on my winter mis haps. but that is another subject. So....
I didn't get to continue posting as I was putting it together because I finished it while my DH was out of state on a work trip and he had the camera. I didn't have very long to get it done, so I worked day and night to get it in before he got back.

Now over the winter I have had trouble. The pictures below are of the box I used to make the filter that was at the back of the pond. Pump in bottom of pond at lowest point with hose bringing it into the box and then pipe to dump it back in. Problem is over the winter I left the box outside and now it leaks. Thing is I can see the water SLOWLY leaking at a spot, but when inspecting the box it doesn't appear to have anything wrong with it. What a pain. SO I do not know if that is because it froze and thawed with water in it, or just from being outside, or pressure from the water or WHAT!
It is a real pain. The everytime I go to clean the box the rocks covering it over the front go all over the place and have to be restacked to hide the pipe that puts the water back in.
I hate this little set up, not to mention the box is terribly unsightly and will have to be disguised with 'something'.....

SO my question now is this.
The sack in the second photo ( I hope you can see it?) Is a laundry bag with foam pieces in it. that is what I had in the box. Why can't I just put my pump IN the bag?? Wouldn't it draw water through the bag-filtering it- and then pump the water through a hose and let that hose empty the water out on the other side of the pond? I was thinking about putting the hose near the bottom, at the deepest part and let it discharge toward the surface, which I think would move the water more in the pond to keep debri 'floating' so that it could be drawn toward the pump/filtering foam.
This would elimate the leaky unsightly box. It would get rid of the 'waterfall' of lopsided rocks that won't stay in place. I don't think it would be any more trouble to clean, just different. The other thing is I have to find a way then to anchor the outlet pipe or a critter could pull it out of the water and my pond would then drain. I have had critters lately. I assume maybe raccoons? I dont know, but whatever it is moved my pump from one side of the pond to the other.
The pond is 6' across and I estimate it to be 450 gals. It is 3 1/2 ' at the deepest part, 1/3 of the pond. Then 1/3 is 2 ' deep and the other third is 1 ' deep. Kind of like a stairs lol

Any ideas ? Do you think it will work?
Also I would LOVE to add a UV filter but I don't really know how. Plus I am broke lol Does anyone have a used one? If so, dmail me and maybe we can work something out?
I guess that is what I need, to get rid of the green water?