By continuing to use the website or clicking Accept you consent to our cookies and personal data policy and confirm that you are at least 18 year old. For details please see Privacy Policy and Terms
90 ppm, you're going to need a calmag supplement till you reach 256 tds ppm wich is 0,4 ms/cm
some products have calcium and nitrogen in them so check the % of calcium or mg in to adjust the amount of calmag.