I guess the deafening silence means nobody knows what hypertufa is :lol: :lol:
Its a mixture of cement, sand and peat used to make planter troughs, garden sculptures, planter troughs, water features and fake rocks. It doesn't weigh much and it absorbs water.
Years ago I saw a gardening programme where they dug a hole, poured the mixture in and when it was set pulled it out again - instant fake rock.
It seems to me it would be easy to pour a fake background using this, if you used a shallow hole, the lumps and bumps would become caves and overhangs and it could be made in separate pieces - which brings me back to my original questions - would it crumble in the water, would it make the water too acid or alkaline?
Cheers
Jude