It should not do any harm as long as you don't have a saltwater pool and if it is a salt-water pool that you are using a non-toxic salt like magnesium and potassium chloride rather then the usual...
An orchid should be watered every 2 weeks.To water an orchid you must place the orchid in a bowl of water and leave for an hour and a half, after this time any remaining water should be poured away.
Set a hose at the base of the shrub so that it just slightly bubbles when you hold it upright five feet from the ground. Water the newly installed shrub (4' - 6') for three hours a day, three days a...