<a href=showthread.php?s=&postid=12918792#post12918792 target=_blank>Originally posted</a> by jnsnams and what is a good parts per million to have at a house?
As Abbysmom stated, ZERO ppm TDS is the ideal for your tank water.
As an example, our tap water in Edmond averages between 250 and 350 ppm. Even if you add chemicals to remove chlorine, there are lots of other things in tap water that you don't want accumulating in your tank, including phosphates, copper, lead, mercury, nitrates and nitrites, etc. ad nauseum. The water evaporates, but the unwanted minerals (TDS) just continue to accumulate with every top off or water change. This buildup may explain why some tanks inexplicably just "crash"...
In my opinion, a RO/DI filter is a necessary investment if you have large tanks; for smaller systems, you can usually obtain RO/DI water from your LFS for around 30 cents a gallon.
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