Greg
Most ponds and lakes are surronded with heavy woods and inflows that run through hemlock forest and oak. Plus heavy snows and ice that store and absorb tanin in great amounts,and drain into ponds. We shoot for at least 60 ppm. Up here at anything at 20ppm or lower fish do not spawn it is a proven fact. Most inflows if possible get a lining of 3/4" limestone a run approx 50ft long and in tiers.
