mike can i ask what reading do you get from the rain water.and how do you pump it to the filters thanks
the tds varies can sometimes be 2 and other times over 30 :
i use filters in the gutters which should be changed weekly really ,but i dont
then if you look at one of the last photos ,the blue box that contains various filters and they are all
gravity fed.
when the tds is high i pump it through the ro then using a cheap £30 pump of ebay.
hope that helps you
mike