Well, I sold my GT86 in August last year, and the filter sat unused in my garage (with water in it) since then, until a couple of weeks ago, when I first washed the GR. I also have a little digital water purity meter which I keep next to it, so I took a quick sample and measured it before using as it had sat for so long....it still registered 0ppm (unfiltered value is about 285ppm). And still didn't leave any spots on the car.On their website they say:
No need to empty vessel of water between washes but advisable to run 2-3 litres through every 2 weeks in summer
What if you don't?
I have similar results with rain water (filtered to 10 µm) but still dry the car. I might give it a try with the wife's car to see what happens when I sun-dry
You do need to replace the resin every so often, about once a year, depending on use. But the resin is a generic product, and the Raceglaze vessel is really no different to the DI water purifiers used by window cleaning companies, so you can buy it from any sort of vendor who supplies that sort of trade. Think you are maybe looking at about £40-50 a year at most for replacement resin (I haven't exactly calculated the costs, sorry), which probably still pales in comparison to the amount I spend on other cleaning products which don't offer anywhere near as much as a time/effort saving
Just to add - I still don't usually leave the car to dry in the sun, it was more a test to see if filtered water would evaporate without leaving marks. Generally I still make sure to wash the car in the evening so it dries in the shade. I don't bother drying the bodywork, but I do sometimes dry the glass with a microfibre to get rid of any smears anyway.
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