Different types of glass are used these days depending on the setting they are employed in. The level of transparency required in these situations varies, and so does the nature of how light is filtered or split when it passes through the glass. Water white glass is one of the types, which is preferred for the transparency it offers.
Also called Low Iron glass or Starphire Glass, this glass has most of its iron oxide removed to achieve the optical effect. This type is more or less on the same level as clear float glass when it comes to transparency achieved. In fact, the two need to be checked against a colored background so you can tell them apart.