Will my Water Softener hurt my fish?
The water here in Arizona is extremely hard (off the chart on my test strips). So we installed a water softener which uses potassium or salt. We chose potassium for the taste and not wanting extra salt in our diet. We also have a reverse osmosis filter system for drinking water.
However, now I am wondering about what water is best for the fish tank. Out of the garden hose tap you get untreated municipal water (the hard stuff). Out of any faucet besides the kitchen sink you get softened water. At the kitchen sink you get softened, and filtered water. I assume that the kitchen water would be best, but then I wondered about the potassium.
If the answer isnt an obvious one, I will do some tests of each source and post the numbers.