not a major problem
I wouldn't expect you to have much problem with mineral build up. I've never heard of anyone running WI that had noticable mineral buildup.
The only area I believe it would an issue is on the nozzle and possibly on the compressor wheel as mentioned above because the water would be evaporating off a surface. In the combustion chamber the microscopic droplets would flash to steam and leave a very small solid particle. In the case of calcium carbonate in the the water, under the heat of combustion it would probably break down to CO2 and calcium oxide, which would then revert back to calcium carbonate when it got the the cooler areas of the exhaust system.
Chlorine would not be a problem. First under high temperatures it would form a very weak hydrocloric acid solution. This interestingly enough is one of the acids commonly used to dissolve mineral build up in the construction trades. It is called Muratic acid in the trades and is a mix of 32% hydrochloric acid., so it would attempt to scavange any mineral build up post combustion chamber.
Second, tape water treated with chlorine will rapidly out gas its chlorine if allowed to "breath" especially if warm. The water will be essentially chlorine free after an hour or two of being added to your reservoir.
Larry
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