 [ Symptoms ] can a celiac toddler swim in a large pond treated with barley straw for algae control  our two year old grandson will be visiting our home soon and we hope to let him swim in our swimmingfish pond that has been treated with a few small bales of barley straw to control the algae [ Disease ] if a toddler can eat barley they can certainly swim in a pond that has a little barley residue assuming the pond does not have any other hazards or contaminates or even snapping turtles and assuming you watch him like a hawk when he is swimming i see no problems with the barley