N. Thornton wrote:

RO also works, but at a price, unless youve got means to heat the
filters to red heat yourself to reactivate them.

???

RO membranes are organic. Heating them to red heat will cause them to
burn. It will definitely not reactivate them!!

They are fairly cheap these days - £30 is about what I pay for the RO
membrane in my system, once a year.

--
Grunff