From: July / August 1987 Texas Diver Magazine on the Blue Lagoon:"The secret of the lagoons clear water is its low pH. Filtering down through the pine needles covering the surrounding land lowers the pH too low to support the growth of algae. Unfortunately, it is also too low to support fish, but the trade off for clear water is worth it."
It is the Pine needles and it is also the Limestone (with copper sulfate - I think) that adds not only the lower pH but the Blue color to the water.
It is the Pine needles and it is also the Limestone (with copper sulfate - I think) that adds not only the lower pH but the Blue color to the water.