No plans on R/O, I did at one time use RO to dilute my tap 50/50. But I stopped and in the last year or so, I have 3 planted tanks doing great on tap and EI dosing. But with the PPS-pro's progam of daily dosing and smaller and less frequent water changes(less waste which is why PPS is interesting to me), will the addition of Mg, be a problem?
And how does one test Calcium and Magnesium, the common Calcium test kits I see at the LFS are for salt, will they work in fresh?