👍Short answer:
She is struggling, lower the TDS!
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💩Long version:
Picture the pot as a glass of juice glued to the floor. You want to drink the juice, but the catch is:
you can’t stick your face into the glass and need to use a straw.
At first, you use a short straw, barely needing one since you are so close to the glass. You take a few sips of juice, but it only tastes like water.
So, you add some juice concentrate to the glass.
As you do, you notice your head gets further and further above the glass, and you need to use a longer straw to reach the juice.
Drinking is still easy, with the glass just a few inches away, and the juice tastes better—a perfect mix of juice and water!
However, if you keep adding more concentrate, you notice something odd.
Your head is now much higher above the glass, and the straw has become very long.
It gets incrementally harder to suck up the juice.
Eventually, the straw is so long that you can’t drink the juice anymore, no matter how hard you try, and you risk dehydration.
High Osmotic Pressure:
When you increase the nutrient content in the soil too much, the roots experience the same problem.
They have more and more difficulty absorbing water because the high concentration of nutrients (just like the juice concentrate) creates high osmotic pressure.
This makes it hard for the plant to take up water, similar to how adding salt to the outside of a piece of meat draws moisture out of it.
So, just like with the juice and straw, adding too much nutrient concentrate can make it impossible for your plant to absorb the water and nutrients it needs, leading to nutrient lockout.
Keep within the sweet-spot or just above for some luxury uptake and keep in mind autos seems to suffer from high TDS more than regulars.
Good luck! 👍😬 Use less EC and be careful not to overwater that huge pot, as it will take ages to dry out and get back to the sweet spot in terms of moisture. The roots need oxygen more than they need NPK nutrients! (Moist soil is good and holds plenty of air/oxygen; damp soil holds lots of water, but too little air/oxygen).