Need ideas for waterfall fake-rock background that's falling apart?

Question:I have a koi pond with a waterfall that shoots into the pond over a fake (styrofoam) rock background. The rock background is about 8' tall, with styrofoam rocks anywhere from 1' long to 3' long. There are a couple problems. 1. A recent wind storm knocked some of the rocks off, they were replaced but look awful now. 2. The paint is coming off many rocks. We've tried replacing this with texture spray paint, but it keeps peeling off every time we turn the waterfall on. 3. We have a pool pump with 1 setting running the waterfall. The water comes out too hard, sprays everywhere rather than gently flowing into the pond. We're lookin to replace this, but until we do we need a sturdy background that won't fall apart and will direct the water down instead of out.

I need ideas on how to replace the rocks. I don't want to spend lots of $. A 1-piece background would be preferable as opposed to many different pieces that need to be separately glued and screwed in.

Ideas?

Answers:
Sounds like you need to add some sort of regualtor valve on the discharge side of the pump. I installed a pvc ball valve in my discharge line and I can adjust the flow of my waterfall by this valve. I have natural rocks in mine. You might want to try something a bit more durable than styrofoam. Real rocks, make some fake rocks/background from concrete.