Hi thanks for your help, I have measured the height from the water level to the top of the falls and it is only 1mtr this is the link to stone and water worlds site which shows the setup I have,http://www.stoneworld.co.nz/wawcs0112251/Water-Features.html#197
It is the large paradise, I got it second hand off trademe. I have put my 3600ltr pump on to it and the flow is quite fast and nice but it does splash over the side a bit which I am worried will slowly empty the pond. Installing a pressurised filter will slow the flow which was the original plan. Not sure about bothering with the UV type, my last pond had a uv and it didn't keep the algae away, only a bag of barley straw cleared it. My previous pond was about 8 times size of this one though.