This is my first grom with Pro-Mix HP plus 25% perlite.
Plants were on cup for about 15 days ten I transplanted to 5gal pot. On my first watering at pot I didn’t took runoff ppm reading but on the second my solutiuon going in was 350ppm and runoff was 1000ppm.
Why that? I never gave them more than 350ppm. Always with 10-20% runoff.
When on cup solution was 350ppm and runoff about 500ppm.
Should I flush it?
Thanks in advance for your help.