I use well water @ ~180 ppm and Pro Mix HP right out of the bale. Just pH the source water to between 6.0 - 6.2 and you should be OK.... My well water runs about 250 ppm is this good for growing in promix or do I need to use ro what do you think ...
What do you use now? If it works, continue.My well water runs about 250 ppm is this good for growing in promix or do I need to use ro what do you think .