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Toto toilets usually have a very good porcelain finish. I would first try a toilet bowl cleaner or a rust remover such as CLR or Lime Away. DO NOT ! MIX ANY OF THESE CHEMICALS UNDER ANY CIRCUMSTANCES! Try one making sure to give it time to work then thouroughly flush the toilet before trying another. The brown stain may be rust or water scale. If the porcelain is actually gone replacing the toilet is probably the only fix. Hope this helps.
If any toilet runs (continues to fill) when it is not being used, there are basically 3 reasons. the most obvious is that water is leaking out all over the floor so the fill valve thinks the tank has not reached its volume of water. Next, the rubber device that keeps the water in the tank when not being used (most commonly called a flapper) has warped from time or chemicals in the water (NOTE:chlorine eats rubber for breakfast daily), and and allows water to seep past it, which lowers the water level and triggers the fill valve to come back on to top things off.
The third reason is because there is particulat in the fill valve or mineral buildup and internally it doesnt always properly seal so it can run intermittently or all the time.
All the parts on the TOTO ultramax are warranteed for 5 years so keep that in mind if it applies.
Remove the tank lid when you hear the fill vave working and look at the water level. If the water level is below the top of the white plastic tube that the flapper is connected to (often called the overflow tube), then you have a bad flapper. If the water level is going over the top of the tube then you have a defective fill valve.
Out of warranty fill valves can easily be replaced with a Lavelle "Quiet fill" available at most hardware or plumbing stores or online.
This valve is what Toto uses in most of their toilets and it is only the removeable cap that is different (subliminal advertising maybe)
When you say 10.5 inches from wall, do you mean that from the center of the drain in the floor to the back wall is 10.5 inches? If so, you need a toilet for a "10 inch rough-in" dimension. The Aquia doesn't come in that dimension. Sorry!
Caroma Sydney Smart model 270 comes in a 10 inch rough-in and is a dual flush model. Note that all dual flush toilets are fairly expensive as compared to normal toilets. HOWEVER, genrally speaking, ALL 10 inch rough-in toilets are fairly expensive just because the low volume that are sold.
Hrm, I see what you mean and this may be a bit late.
The 14" rough in is not standard (as in 12") and the depth (from the back of the tank to the front edge of the bowl is your concern here?).
Kohler also has a Sterling brand with the Windham model. This will sit on the 14" rough and measure less than 30" from the back wall.
You could also go with a Toto ($$$ concerns) as they have a unifit system that allows for adjustment from your roughed in closet/toilet flange. It basically mounts to your flange and then sets back 2" or 4" depending on which model Toto toiler you are installing. The Soiree-?sp may be your best bet for depth concerns, but not so good for your wallet.
if you have a 10" rough in your house you can not install a 12" rough toilet. but if you have a 12" rough in your house you can install a 10" rough you would just have a 2 inch gap between the toilet and the wall.
the rough is measured by measuring the middle of the sewer hole. that your toilett sits on. to the back of the wall this is important because the tank sits behind the toilet. if the tank is too big then the toilet wont fit over the sewer hole.
your house shouldnt have a 10 inch rough unless its about 90 to 100 years old most home's now days go off a 12" to 14" rough.
if you do have an old home you can order any 10" rough toilet at a plumbing supply store. or lowes. they probably wont carry them in stock though because 100 year old houses aren't very common