The other day the water was shut off in our building for a plumbing repair. When it was turned on again, I filled a clear glass with cold tapwater and held it up to an external window. I could see tiny particles floating. (They don't seem to be bubbles; though I am not certain.) A test conducted today yielded the same result.
Today I also examined water from the bathroom's cold-water faucet; the glass filled with obvious bubbles, but when they disappeared, the water looked clear. The kitchen cold-water faucet doesn't fill the glass with bubbles, but the "particles" I observed today rose to the surface--evidence of bubbles?
How can I determine if they're bubbles or particles?
If they are particles, what do you recommend? A Britaâ„¢ or other filter (I'd love to get a reverse-osmosis filter, but no decent consumer models seem to be available)? Should I contact building management? Should I test water from other apartments? Are cheap water home-testing kits available?