We are considering purchasing a patio umbrella mosquito netting that fits over a market style patio table umbrella. This system has a bottom with Built-in Water or Sand Fillable Tube that Keeps the bottom of the screen taut and helps keep the wind from blowing the screen all over. We have read that some of these tubes leak getting sand or water all over. Does anyone have one of these and have you found another solution to keep the bottom down.

Thanks for your help.