I’ll be honest that I haven’t really checked the ec as i didn’t have any problems with my 1st hydro grow but I’m using distilled water and changing weekly using fox farm hydro schedule. First week I did about half recommended strength with grow big and big bloom, then I saw she wasn’t getting enough nutrients and may have over corrected using full strength with the grow big, big bloom, kangaroo roots and microbe brew. Then I saw what I thought was a little burn so in my water change last night I put about 3/4 strength recommended for grow big, big bloom and microbe brew.
I had also flushed yesterday with sledgehammer for an hour before I changed out the water and nutrients.