As I said earlier all is good
Dail in your base water lowering it’s ec and sort out ca , Lower n and start raisin pk now and you’ll have nice buds : )
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You could and its good practice like @George mentioned:metal: 
Try doing a microdose of balance nutes with a shot a cal mag. I do it once a week when I feed in coco in early veg up to late veg. Throwing a microdose of balanced nutes and a shot of cal-mag works as a “micro flush” Doing it periodically keeps things moving clean for me. In my experience 
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I fight my N excess with this:
A good and cheaper alternative to an RO filter could be a professional dehumidifier with an exahust to an external deposit, that water is pretty like RO, real low ppm and good pH, you could use it and mix to your tap water to lower EC, I’ve got one and water my plants with it … 
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I actually use pk13/14 of Canna.But in very low doses,like 1/8.
Money wise the Ro system was 50-60 euros+pump 30-40.I don’t know If a good dehumidifier would be Better,as Electric Bill is going to kill me AHAHAHHHHAHAH
Thank you @George,Always on point.
Thank you @ColeLennon for your technique of “micro flushes”
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