Good chart to go by, I average the same ec as that chart during growth.
I ran these numbers, but the highest I went was 2.1 ec
And that was 3 weeks before flush for two feedings then it went down in ec from there.
(Was running botanicare line, but recently did the switch to jacks “city limits”) [includes calmag in the nutes and doesn’t jack up the Ph as hard as the botanicare did, which for a 2.1 ec feed brought my water to 3.8 ph. With jacks it brings me to 5.2]