Selenium

We are not currently making this as ESV Alkalinity has so much selenium in it, just dose that.

Dose 0.4 ml per gallon of ESV Alkalinity to raise your Selenium by 0.1 ppb

If you are using ESV alk as your main Alkalinity supplement, pay close attention to your selenium levels as they are probably too high. Add some GFO to get your selenium back to save levels within 5 days, just watch and dose your other trace elements after.