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Water test

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I use API, but unfortunately all the tests dont come in one


API Master Test kit which you may use the ammonia, nitrate, nitrite, pH test

GH/KH you have to buy separately

Copper you have to buy separately 
TDS pen could be useful as well


If you're past the setup phase and just in the maintenance phase I would probably recommend GH, TDS at the minimum


TBH since I know what my remineralizer shoots a 130 tds for 5 gh, I only use my TDS pen most of the time over anything else.

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