PPM way too high after adding few nutes

Using r\o water.. it's coming out at 4PPM.

I added 8 ML per gallon of Hygrozime and then 10 ML per gallon of Liquid Karma.

I'm using a Botanicare 40 gallon resi.

After adding that I read 350 which seemed high to me.

I then added 100ML (not even three ML per gallon!) of my grow nutes...and I'm at 600 already.

Does this not sound right to anyone else? My PPM stick seems to be working fine.

Hygrozime tends to not effect PPM a ton, but I'm confused?

went a little fast with them, I'm currently at 620 which I think is fine.... but around the original time of this post I shoulda been more so at 525 or so

that seems low to me, i use a whole slew of gh nutes and end up with a ppm of 1280, which i ph down to 5.5 and the plants love it, i flush once every month or so to