Im still learning 
So am I… And I never measure anything, so I couldn’t recommend anything here… @OGIncognito , @AfgVet , @Bulldognuts are great people to ask… 
I keep a record of every feed in and out numbers , that lets me find the EC that holds mine steady from feed to feed. You don’t want over 1000 ppm anyway. What have you been feeding for EC? Go in at 200 over what you’ve been feeding. And check next runoff.
Okay thankyou i dont understand ec completely yet i didnt write it down but it was at 1.7 i believe
But i could be wrong
Oh what have i been feeding? Im not sure my friend ive been going by ppm but i will try to understand and use ec as well im always willing to learn
Ppm and EC are close, 1.0 EC is 500 ppms Your looking at 1000 ppm equals 2.0 EC. EC is just used to measure nute strength, electrical conductivity.
So i would feed my plant that is at 800 ppm 1000 ppm feed to get it to 1000 or close?
I was afraid of supercropping until I tried it.
Then I snapped all but a bit of skin off a flowering branch. It didn’t notice a dog-on thing.
I could flop it around and it held on with that famous hemp strength, and ended up no different than any other branch.
Not really supercropping. Held on only by bark. 
Whatever your last feed ppm was, add 200 ppm to that. Then do same next watering and check runoff to see if ppm needs to decrease or increase to maintain 1000.
Okay thankyou
Curious…is the plant showing deficiencies?? Good suggestions from @Growdoc 
Greetings, brother.
When you do find what you are wanting to achieve remember the plant eats the nutrients and is constantly lowers the PPM or E.C. in your pot. Understanding E.C. isn’t a science I sent you conversation charts a while back here it is again. And remember this. It is better to follow the mixed up input of nutrients on the feeding chart than the run off. Searched information:
Yes, maintaining a specific parts per million (ppm) level in hard water can be challenging, but it’s achievable with proper treatment and maintenance.
Take care
I will have to respectfully disagree sir. If you only monitor input, you have no idea how much of that they are eating, and you can build up nutes and cause lockout from tanking the ph. Checking runoff tells me how much they eat each feeding and if my ph is swinging. If I go by input, I have no idea what’s coming out or what they use, going by runoff, I adjust each feed to maintain a certain EC coming out, meaning the same concentration of nutes are steady in the medium. It also tells me if there’s any change in ph which could indicate other problems on the horizon. Hope you have a great day sir!
Greetings, brother.
I do do both and everyone should. I was saying that following a proper feeding schedule and PHed mixture you should not be having issues and I believe that is the most important but not to forget the later.
I believe the work put into my nutrients source and trust in them that the recommend mixtures are within a safe range for the plan to use up the recommend nutrients, unless your over feeding and not following good maintenance in-between feedings.
Doing so I never have had issues of locked out, not saying it can’t happen. I just don’t chase numbers when I know my inputs are being monitored everytime. Hellraiser on this site long ago taught me when I first started out not to chase numbers on amended soils. He taught me the most important thing is to read the leaves.
Yes all is important but I just don’t sweat the run off every time.
Have a blessed day.
Agreed on soils, I grow in Promix and coco. But yes, fed properly, you shouldn’t have problems but runoff numbers will tell you before they become big problems. Have a blessed day sir!
Greetings, brother.
Don’t sweat the petty things but pet the sweating things.
Take care brother.
Looks like @Growdoc has you covered
It was showing calmag deficiency but i got that in order and is drinking water fine i figured i need my ph to be 6.5 or 6.8 and it was at 6.0 i fed this morning 988 ppm with 7.0 ph mix and runoff came out to be 1156 and ph 6.3 is that bad?