In a word, yes.
Municipal water can vary from location to location (even between 2 streets in the same town) and from time to time.
Keeping a reef setup is complex enough; you don't need the water gods rolling the dice on you each time you open the tap.
Get an RO/DI system. It pays for itself. Period.
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-Mark
29 Gal Bowfront w/24" LED Lights. DIY HOB Sump (5.4 Gal) MP40. Orange Spotted Watchman Goby, 2 Clownfish and a few hermits.
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