I use a dilute fertilizer solution at every watering; have not flushed with plain water in 15 years.
Cooling is only an issue if your evaporation rate is high - too little humidity, and/or too much air movement - AND you are growing your plants too cool to start with.
Mineral buildup occurs in all media, with the rate being dependent upon the combination of what is in your water (minerals already there plus fertilizers added), frequency of watering, and your evaporation rate. With organic materials, they decompose and we change them before it is a major issue. The tendency with inorganic media components is to forget that until it's too late.
Connie, I don't know exactly what issues you are having, but changing to RO probably won't solve them. I'd look elsewhere for the answer.
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