I have this TDS tester.
It only measures ppm
Says it was calibrated to 500 us/cm
My question is. When I read it and it says
1400 ppm. Is that the actually ppm of nutrients
Or do I need to use a conversion factor?
What nutrient chart do I go by for best results?
They all seem so different.
I'm using masterblend 4-18-38. Mixed with added
Calcium nitrate to bring me to a 20-18-38 npk
Masterblend says to mix 12 grams per 5 gallons
But was wonderig what nutrient chart to use if I want to
Brad from mi