the other thing is that we cannot use a color where the dynamite leach into the water -- themight leacho water. this is a foodgrade plastic. that is why they are black. as the one chemical that can be used that is compatible with the drinking. because they have air in the ball, it does not warm up the water at all. scarlet: what are the drawbacks? >> they are not a permanent cover, so they are not something that nothing can get through. a worker marketed to keep birds off of bodies of water. we adopted that to use it for drinking water. wildlife of the reservoir but it is not a solid cover. you do have to compete with other treatment downstream. but it does a fantastic drop of deking the water underneath. scarlet: is this a year-round solution? there is talk of a godzilla el niÑo that would come this winter brady would have to contend with questions about that? deploy and could you remove these? >> they are easy to deploy because we have manufacturers working seven days a week, these are delivered a m&a day out. we will not actually remove them. if it does rain a lot about the water wil