Understanding feed schedule

Hi.
If nute scheme says 0.8 ec nutes, does this mean, if tap water is 0.4, a total of 1.2 (0.4+0.8 or does this mean a total of 0.8 (0.4 tap water+ 0.4 nutes)?
 

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Unless you have extremely high ec from the tap I've always read you don't count the tap ec. If you have extremely high from the tap you really shouldn't be using it. Is 200ppm high, I only have 90ppm in my tap, not sure about this specific aspect.

You have no clue what's in your tap, it's different for everyone, and it's not always good. If you count the tap ec there is a good chance of finding yourself with a deficiency later.
 
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