What's the PPM of your water going into your supersoil?

Hey guys, having some issues that I've never experienced before, and I'm going down my checklist of things I could be doing wrong. Basically, my plants look pretty fantastic all the way through veg and then start showing what appears to be magnesium lockout about a week into flower. This has happened with 4 different plants now and I'm starting to get frustrated with what it could be.

Down to why I started this thread though, what is the PPM of your water going not your supersoil?

ive used both GO cal mag and botanicare cal mag at the recommended 5ml, then 7 ml, then 10 ml and I'm not seeng any sort of correction. The ppm ranges from 300-600 ppm when I add this to my R/O and that seems awfully high to me, hell, the well water at my house is 280 ppm, and that's why I initially bought the R/O.

Well, you have to start off by making a list of every single thing that you change from vegetative to flowering, and narrow down the variables to form hypotheses. What did you change? If you have been using well water with no ion buildup in veg and the plants were fine, there may be other variables at work.

Have you checked the PH? Normally you don't need to PH with Super Soil (per sub), but maybe your water is really bad? High PH can cause P/K/cal/mag lockout.

Your going to want to be more vigilant of your PH before and the run off from the pot after watering. Your ppm will vary on nutes and strains and how your plants are eating and drinking but your ph needs to be maintained to stop nutrient salt lockout.

FilthyFletch said:

Your going to want to be more vigilant of your PH before and the run off from the pot after watering. Your ppm will vary on nutes and strains and how your plants are eating and drinking but your ph needs to be maintained to stop nutrient salt lockout.

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You gotta be talking about synthetic nutes right?


You cant necessarily count the ppm thats coming out of your well against even 600ppm of ca/mg+ or whatever... Your adding that and you know where that 600ppm is coming from, the 280ppm coming out of your well could be anything... Its whatever is in your water table and is of no real consequence and is why you dont wanna use it.. It could be good but it could be very bad too... You can send it out and have it tested fairly cheap I think... They sell kits or they may even be free at home depot or lowes to get your water checked...

In the first weeks of flowering your plants are storing up as well as using everything they can get to stretch and bud-set.... Its the most nutrients they are ever gonna use at any point throughout their entire life cycle... When in veg they're growing but they are basically on cruise control if your doing it right.... It doesnt take much nutrition to keep them growing vigorously and healthy... it does but its probably doubling or even more once you flip them and start getting into weeks 2 and 3, after the halfway point they slow down on pretty much everything but those first few weeks are the important ones... Just watch when you do catch up that you arent over doing it at that point because more than likely once you catch up is probably right where they're gonna lay off and wont need as much, just plan by week 4 or 5, or wherever the estimated halfway point is to slow down on pretty much everything and just go with finishing teas or molasses, but just RO after week 6 - 6.5 (on a 8 week strain)...

Watch it with the ca/mg and molasses together... with that they're getting a double dose of magnesium... When you give them teas or if you just throw some molasses in water, dont add ca/mg... The ca/mg+ from GO has sugars in it already as well so dont mix those if you can avoid aside from teas and minimal amounts..

However... I'm actually having the same problem you are at the moment myself with a batch of cheese quakes..... No matter how much ca/mg+ I give them I cant catch up... I'm ready to foliar it before they start growing bud... I just flipped them a week or so ago... They were very dark dark green before I flipped, now they're already lightening up on me, this was a few days ago...