TDS  your rain water  it's between 002-004 on average sometimes 006 
It's lower than many sometimes use to clean, any how I just turn up the flow and crack on 
, all customers trained I work in all weather 
I quite like working in the rain, people don't want to stand and talk so it s great 
Only time I stop Is lighting storms seems daft waving along carbon pole around waiting to catch a spark , even my daughter got used to it now although she's much  quicker in the rain, as she wants to get back in the van