Found weird chalky off white build up blocking 1/4-1/3 of the toilet drain pipe - clinging to the rear wall of the pipe thicker at the flange and tapering to nothing at the elbow (about 10 inches down) - think it may be lime scale. It was causing toilet to flush strangely (swirling bits of TP left over) and clog frequently requiring plunging. I scraped it out, and I am about to put a new flange in.. hoping for the best, but thinking hard water/metal flange may be the issue. Toilet was put in about 25-30 years ago, so it was a slow process.

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