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you shouldnt have to rinse for a hour, seems a bit long to me , iwas told 5 mins thats all you need to do it for.
Due to weather conditions you can sometimes experience different results. For instance water temperature, incoming TDS and simply a drop in water pressure due to the hot weather (hosepipes etc)Also, if you had a couple of days of heavy rain, sometimes the TDS can go up as well.I wouldn't worry too much about it.