The pond is - of course - a closed body of water, with fairly nutrient-rich supernatatant being added daily from our waste water bio-digester. The grass-eating, in-pond-pooping ducks will be adding a very small amount, too. I imagine seepage losses are probably equal to the inputs, but that's a guess.
I could get some water testing done, but what use would that be? Beyond telling me the 'state' of the water. It's not a swimming pool! I can't imagine what I could do to change any aspect of the water's dissolved salts / other components, realistically.
For the time being, a keep waiting and watching stance seems akin to a masterly policy of inactivity, to me.
