Originally Posted by ewest
There are lots of non-oak tannin waters. Most swamps are much like that. One key is good alkalinity. Add ag lime to improve the water quality. Always smart to have a good buffer.

More good info!

However, the oak forest ponds I fished as a youth were where the Flint Hills (all limestones and shales) gave way to sandstone outcrops. I am fairly certain the soils for these ponds were acidic, even prior to any tannic acids introduced by the oak leaves and twigs.

I am still perplexed. (But that happens quite often while I am reading on Pond Boss!)