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My tap water has a ppm of 390 what is the best way to get pure water I have no where to run waste water from a ro to as planing to put a tank in my van.
If you got £200 to spare then it's worth getting a 1000L ibc tank off eBay & another 25L DI vessel (will pay itself off in couple months with saved resin costs) then put the 11L one in your van(?) as a polisher for when you use the rainwater.