I am having real trouble here. The leaflet says to cover the container with kitchen towel and tip over - the water should drain through and the sand should stay in the paper. Last time I tried this it all tipped into the sink and I lost the lot.
Any magic sand experts out there please?
Use triple sheets of kitchen roll and make sure you hold all round the edge (or as much as possible). Alternatively put an elastic band round it.
OTOH let the kids do it themselves & you'll never have to worry about it again