notbob wrote:
On 2013-04-08, John wrote:

the glaze is probably already deteriorated.

That would account for the rough porous feel to the glaze. I hope
that's not the case.


The roughness is from lime deposits which may be further stained by iron.
Citric, phosphoric or any other acid will remove both but you are better off
using the milder citric or phosphoric as opposed to hydrochloric (muriatic).

For the bottom of the bowl, shut off the water supply to it and flush so
that there is minimal water left; then add the acid and let sit for several
hours. If it (deposit) is all gone, turn on water and flush; if it is not,
repeat the acid.

The stains under and down from the rim are harder as they need to be kept
wet with the acidic soultion; one way is to saturate paper towels with the
solution and pat them in place. Close the seat and wait, repeat as
necessary.

Your long term solution is to soften the water. That will solve the lime
problem and may solve the rust depending on how much iron is in the water.
If the softened water still results in iron stains, your solutions are to
also get an iron removal system (not cheap) or periodically clean with acid.


--

dadiOH
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