Okay that's great! Yeah then I guess whether a third layer is desirable when printing from the bottom depends on how thick a layer of uncured resin is there. To save money less resin could be put in the container initially and fresh water could be added on top.

Regardless of whether the freshwater is used or just extra resin I don't think that printing from the bottom is that big of a deal. It will be pretty awesome to have zero ripple effect.