First Ebb Flow

This week I renewed the ro water in the reservoir, do I need to flush it again?

Ph 5.8 ~ 6.0, 750ppm

Would 50 ml pk 13-14 be enough for 33 gallons of water?

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We share the same reservoir with tall plants in auto-flowering and the photo-period plants on the other table.

Is it possible to have a potassium problem due to this? Do I need to make the reservoirs separately?
 
I need some tips on nute chart after reservoir change
For example, how do you do this during the flowering phase?

I've done DWC many times before. I always went halfway through the measurements written on the bottle. I had no problems
 
It is time to bloom for my photoperiod plants (8ballkush, sugarpop, fruity jack) and after this week I am planning 12/12. They share the same room and reservoir with my auto plants(Critical orange punch auto) . I hope we don't have any problems.

Ph 5.8 / 6.0
Ppm 800 ,ec 1.6,
reservoir water 68f
Room 77f

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???
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