I responded to an ad for free water testing. Of course, the testing is designed to scare you into buying a whole-house reverse osmosis system for over $3,000. But one thing the guy did scared me.
He tool two drinking glasses and filled on with water from my Brita container and the other with water he brought along that supposedly is from the output of the system he's trying to sell me.
He had a electrolysis gadget, about 9" long by 1.5 x 1.5 with two pairs of electrodes. He stuck one pair in each glass, plugged into a wall outlet, and turned it on. After 15 minutes or so, the garbage that was in the Brita water was scary; his water glass was only slightly tinted yellow. I pointed out that one electrode of each pair was eroded. He offered to swap the glasses and repeat the test, but I declined.
I measured the voltages across each pair of electrodes: 240 VAC and 110 VDC. The unit had a decal on it that says waterfilteronline.com, but when I went to the site there was no such product. And their tech support guy had no idea what I was talking about.
So what was all this garbage in the electrolyzed Brita water? I'm sure it was a scam; the guy left nothing in writing about his measurements, insisted the electrolyzed water be poured down the drain and didn't even leave a business card or other way of contacting his company, Florida Water Analysis.