I've done it too. I used garden compost, like Verdun, and left it for a year to settle. It grew a grand crop of weeds, so must be fertile! I started planting it up in the autumn and will finish off this spring. If not enough compost is available, soil from elsewhere would be fine. Not sure what could be used if you need to buy it in - topsoil, I suppose.
How to fill will depend to an extent on the size and depth of the pool and the material available. I filled in a large pond approx 18' x 6' x 2' deep by dumping the stone previously used for edging in the bottom along with any other rubble I could find for the bottom 12", topped that with soil from raised beds around the pool and soil from other areas of the garden where I wanted to change the levels.
Landgirl100 makes an important point about leaving the ground to settle. I actually did the work in the autumn and then left over 2 winters i.e. about 18 months before doing anything with it. That was to allow the soil time to be taken down around the stones. If you will completely with soil, 12 months should be fine.
You could have some of the topsoil we've got - we're digging out a pond
A friend of mine had a small pond which he turned into a stunning bog garden by clearing it of wildlife (which he rehomed) and added compost to the partially full pond.
I filled in 2 ponds 2 years ago, using bought compost, you would not believe how much I needed, good job it was on offer locally. Attempted grassing over with poor results. Now have two sunken 'lawns' still poor condition. Would agree you need to allow lots of time for settling.
can any one help with some advice please ,How much rubble do I order to fill in a pond approx10x9 5 ft deep or do you think it would be cheaper to order some more butyl liner and fill it with water I do miss the sound of running water at night Biggest regret this year my garden in like Beirut single disable lady what a challenge ant advise is appreciated
thomas leng says:Thanks. Will fill bottom with rubble and then top with soil. Will leave to resettle. Its a fair size! Just emptying has been a mammoth task!!!! See original post
You will have to accept that there will be a lot of settling over time. I have a raised bed, roughtly 2 foot deep, where the bottom 9" or so were filled with rubble and then filled up to the top with soil. That was 3 years ago and the soil level has dropped by between 6 and 8 inches as it drops into the gaps in the rubble and compresses and consolidates under the effect of weather. It's hard to understand how the soil level can drop by an amount almost equal to the initial depth of rubble, but it has.