My only query with this is can the cement mix be moulded? I had an idea of pulling out the existing pond and instead making it larger but when we worked out the expenses it was around £250. Now you've got me thinking that I can still replace the current pond with a new and larger one.
I don't want to build it then a little while after filling it find that the cement is cracking under the weight of the water. How thick would you have the sides? At the moment its one of those pre-fab plastic shells with the deepest part being 4ft but I think 3ft is deep enough. I'd like to add wider shelves for plant tubs, a shallow end for easy access for wildlife and a built-in water feature if I was to make an area to house the bio box filter. The water filter would be a stream from the bio filter which is about 1ft above the water. I'd have pebbles in it for aesthetics
My girlfriend works for a nationwide DIY store so we can get discount on a lot of the materials saving some cash. I spent 3 years as a general builder working for a local building company so I've got some skills cementing.