Inside an espresso boiler running two years on filtered GTA tap: blue-green copper oxidation, brown biofilm, scaled-over gaskets. Distilled water stops the damage. Here’s the honest answer to “does distilled make coffee taste flat” — plus the pod-machine and Keurig caveats worth knowing.
Some ice maker manuals warn against distilled water. It’s not a quality problem — it’s a sensor limit. Distilled water is too pure to conduct electricity, so conductivity-based water-level sensors can’t see it. Here’s how to tell which appliances need tap and which ones genuinely need distilled.
GTA tap water is hard — Brampton 200–250, Toronto ~120 mg/L of calcium carbonate. That’s the source of every kettle scale crust, coffee maker ring, and humidifier white dust. The simplest fix is the right water in the right small appliances, no plumbing required.
Daily, weekly, and deep-clean routines for stainless steel water bottles — and why a final distilled-water rinse stops mineral spots and odours before they start.