Could anyone recommend an alternative resourse we could use at our pre-school playgroup instead of sand. We have a separate water tough and pouring equipment watering cans, buckets, jugs etc. We have tried using corn and lentils/split peas which has had safety issues of slipping and being difficult to sweep away. Being a food item we do not want it to be used in the outside area as it may encourage vermin. The disposal of it is taking valuable time away from the children. Is there anything safe and bio-degradeable which we could try? Your help is greatly appreciated. a first time poster!