Hi Darrel!
Yes, thats nearly same TDS as I get from my RO-unit. pH drowned, thou slowly, from about 7,2 down to 6,2 (WC 50%rw-50%tap), pH of the rainwater is about 5,2-5,4. I avoided to use rw about 10-30min since rain started, but still there was sometimes black dust (smutch) from the roof...