I noticed a what I thought was a "hairline crack" on the front of my toilet base... but I think its more appropriately called "crazing" on the glaze (the toilet's about 30 years, small wonder - but is otherwise in good condition). There is nothing on the tank or inside the bowl. I'd like to know if glaze crazing on the outside of the bowl is serious enough to warrant paying a plumber to replace the toilet. Can the bowl just shatter by itself even before such defects show up on the inside? Also, is it serious if the bowl cracks, or is the tank holding the bulk of the water the main concern?
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