Yes there is. Don't use it. If you must, buy RO water from your local grocery store or Wallmart. All the store water I've bought had a TDS of 23-50ppm. Your tap water is more likely to run 350-450 ppm TDS. If you invest in a good RO/DI system you can make water under 1 ppm TDS. It's well worth the couple hundred dollar investment. Tap water has all kinds of things in in that are not good for your salt water aquarium.
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