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hi guys i wanted to know if anyone can tell me why after calibrating my ph meter im reading a ph of 3 after i add canna aqua even if i dont put my acid in

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i have been adding canna aqua at an ec of 1.2.Plants are still young and are nothern lights for what its worth.I test ph after adding nutes and its reading 3.8

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before nutes are added ph is where it should be(7)after nutes are added 3.8 and its doing my head in.I calabrated meter thinking it may be problem but meter seems to read true

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