reverse osmosis
Hey Marco, welcome to the board.
The best advice for using tap water is to test it. Test it for all the things that will be harmful to your tank, especially chlorine, ammonia, nitrites, nitrates, phosphates and metals (copper kills inverts).
Our municipal water is pretty clean here as well, registering only 17ppm on my TDS meter, but contains chlorine and phosphates, so I bought an RO/DI unit which gives me ultra-pure water at 0ppm.
If your tap water tests out ok, great. If not, then invest in an RO/DI unit as it's much cheaper in the long run than buying RO water from the supermarket or water delivery companies.
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