Hey word, you don't really have to flush unless you are trying to fix a problem with a plant (as you are). But when things are running right, you don't so much flush as you do change. I would at least do it 2 or 3 times per month, unless you have some problems. If so it might be caused by your salt content being too high from lack of flushing often enough. When your res level gets lower, and you add to it, and you keep doing it, pretty soon the part that's left is full of salts and bad stuff, and your total PPM gets way too high. That's why we "flush" on a regular basis; to get that stuff out of our systems and get a proper nutrient solution in.

Now we also flush to get bad stuff out of our plants. When you are doing this you flush more at one time. It might be good if you fed with nothing but PHd water for a couple three days, changing the res once per day or so. That way hopefully the plant will at least get somewhat cleansed of the bad stuff. Then you can start feeding at about 1/3 strength. Start with 1 thing, probably your main grow nutrients. Watch for a couple days for signs of stress, then you could bump up the PPM or try adding an additive (perhaps two drops of superthrive), but don't do both at the same time. If you do any two changes at once you won't be certain which is the trouble maker. If your pretty sure you have a calcium deficiency, then you might want your second ingredient to be whatever fixes that, perhaps CalMag. That's pretty much what I take the other "flushing" to mean. But I wouldn't be surprised it's just because they gave you suckie nutrients, and once you start giving them some real food they will most likely start really taking off, and being healthy at the same time.

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