Why does just one toilet in a 3 bathroom house develop major mineral deposits?


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Old 07-02-15, 07:58 PM
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Why does just one toilet in a 3 bathroom house develop major mineral deposits?

I don't really have an overwhelmingly big hard water problem. My white laundry doesn't turn rust color, and the other toilets don't exhibit a major problem, but one of the 3 builds up huge mineral deposits. It's the same exact toilet as one of the other toilets, and like I said, all connected to the same water from the city. I would have more expected either all of them or none of them to have a problem, but just one?

Very old house, but replumbed, so it's all PVC pipes, circa about 2000.
 
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Old 07-02-15, 08:04 PM
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Does this toilet use old steel water lines and maybe the other lines were updated? Are there any rusted parts in the tank?
 
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Old 07-02-15, 08:12 PM
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Is that toilet the closest fixture to the water meter? How many floors are in the house?
 
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Old 07-02-15, 08:13 PM
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Nope, all PVC pipes now, and the tank itself looks squeaky clean. The bowl on the other hand...
 
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Old 07-02-15, 08:19 PM
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@pulpo, it's not the closest, and a one story home. The bathroom sink and bathtub in the same bathroom don't get all minerally. It is a replacement valve, from roughly 5 years ago perhaps. It flushes well after a good cleaning, until the mineral build up messes with the pressure from the main nozzle. Some tough love with a wire hanger (reaming out the main jet and the little ones up under the rim) gets it flushing well again for a while.
 
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Old 07-02-15, 08:40 PM
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What about a chemical reaction inside the tank? Wild guess.
 
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Old 07-02-15, 09:03 PM
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Yeah, no telling. I don't think I've ever tried any of the sit-in-bowl style cleaner things on this, because last time I tried in a different toilet many years ago, it turned into a terrifying looking mush of goop. It is a mystery.
 
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Old 07-03-15, 05:08 AM
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I know that you said that PVC is used but are there two dissimilar metals touching each other somewhere along the line? That can cause a chemical reaction. Did you mean that the fill valve, in the tank is about 5 years old? What about the shut-off valve & the connector? Put on your detective's hat.
 
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Old 07-08-15, 09:14 PM
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Good point, Pulpo... there is a bit of metal, from the tank to the wall. It's still a bit odd, one of the other two toilets was put in at the same time, same toilet, same builder. One of life's mysteries, I suppose. Thanks for the help, sorry for the delay replying.
 
 

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