Doesn't it have a U shaped liner flange on the front?

Anyways, the typical thing to do with those filter falls is to have them dump into an EPDM liner that runs to the pond. If you want a high waterfall you have to build that area up.

A picture would help.

My filter is sort of like this one: http://waterscapesinternational.com/?page_id=187 except a little smaller, like 12" across. What I'm reading is that maybe it came with a "flange" and I was supposed to attach liner to the front of it, but I never did (too intimidated!). I just bought a small piece of liner and I'm going to put it around the filter and make a "chute" coming down from that lip area and then build it up all around with rocks. And pray. Or something.

rocks in front and liner encompasses the whole thing

Wow, indoors!!! I would consider that in my NYC home except the r-a-t-s would consider it a standing invitation!

The other issue is: I understand that, with liner all around, you won't actually lose water from backflow, but I would think with all the splashing around, and the rocks not being glued together, you would get quite a bit of evaporation. But maybe your pump is powerful enough that it's propelling most of the water downwards into the pond.

THANKS!!!!

Well here's a photo of where I am now:

With the way you have the waterfall module positioned, you are basically creating a mini stream. That is typically done by placing the liner under the outflow lip of the waterfall module and then running it over the edge of the pond like so.

Here's a quickie section view I drew that might help you visualize how to put the whole thing together.

With the liner piece that you have, you could move the waterfall module further back from the edge of the pond if you wanted.

Nil13 usda:9a sunset:21 LA,CA You are amazing!!! Thank you so much.

Also I recommend holding off on trimming the liner down until you have it working the way you want.

Question: After gluing, the new liner is going to make a "chute," is that correct? (attached with that cement stuff to the sides of the filter as well as under the lip) -- And that chute will have to be covered by rocks, otherwise it will look obvious and weird. I think maybe I don't understand what is supposed to happen to the "wings" (sides) of the new piece of liner. I envision them flipping upward to form that "chute." When I look at videos showing people attaching their liners to their filters (they seem to screw the liner onto a special plate that came with their filters (that I don't have)), I don't understand what's happening to the sides of their pieces of liner. Don't the sides have to be folded UP to hold in the water as it flows downward into the pond? If the liner's just flat, the water can just flow over the sides of the new piece of liner, right? Sorry, I think I'm spatially challenged!

Yes, you making a "chute" with the liner and it will need to be covered by rocks. But as long as the wings are higher than the middle of the liner where the water flows the water will be contained. Just clothespin the liner to the lip and play with the liner to start to understand how the water is going to fall back to the pond.

Here is where we are now: it looks great. Yesterday, however, after two days with pump on, the pond drained by half! So we put in a bunch of foam, then put some dirt and rocks on it to make it look more natural, and turned the pump back on. We shall see if the water stays in now!

Looks great. It can be tricky to find where the water is sneaking out but you'll get it squared away.