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Originally Posted by tophcfa

Reconcile this? That pond has been there since approximately the turn of the century. It has never been in its current condition. What gives between now and the last quarter century?

The maintenance may have been neglected. It’s easy to kill weeds in ponds and dye them indigo. Just use copper sulphate for the weeds and pour in some Aquablue or a similar die. The problem with most of these ponds is the depth and fertilizer. Sunlight easily penetrates to the bottom allowing rapid growth here in Florida. The fertilizer eventually leads to the eutrophication you mentioned.