I want to shore up the side of a garden pond using the hessian sacks one see’s built alongside a riverside but I have no idea what the sand/cement mix is and whether one can just place them in the water or do they only work in a dry place and left to weather.
Think they're just a dry mix concrete, the ones you see on a riverbank can sometimes contain a dissoluble liner that dissolves as soon as it gets wet but that's more to do with the practicalities of them being stored/transported beforehand etc so I would think a DIY approach would work, concrete sets under water.
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