Water source is 3 creeks that drain into the basin which holds the lake, which are in turn fed from runoff, and some springs that are fed by runoff, from many square miles of what is basically pine forest growing in extremely sandy soil-not hard to see where all the tannins come from!! There is minimal to no limestone in the drainage basin, mostly just deep layers of relatively coarse silica covered by a thin layer of soil and deep pine compost. The soil does a fine job of filtering particulates-but offers basically nothing to buffer the tannic acid coming from the pines.
Sunil really perked up while we were talking about filtering, but as soon as he realized we were discussng "limestone filtering" instead of "cold filtering" his attention seemed to wander.
