[Ian101]

I use rainwater which the tds is 45!

do u di it before use though ?

[gary999]

If you have a shed put a piece of perspex on roof bit of guttering
and downpipes stocking over downpipes catch the crud,clean regulary
and i average 14ppm and have had low as 2ppm.

Got water in my water butts today from last nights downpour
frst time in what seems months

[wfp master]

if the rain water is 20 tds  no need for d/i. just fire it in yer tank & off you go.
20tds is fine for cleaning windows.[so they say]