Yep, some people have excellent tap water and can actually get away with using it. It's certainly not something I would try without testing my water first though. Also at 4 months, IME it's too early to be claiming success. When I first started out I didn't know any better and I used tap water. Everything was fine for the first 8 months or so when small patches of cyano started showing up. It got progressively worse until I finally just broke down and started over with RO after about a year and a half.
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