What should tds and ppm be

Grow Cycle
1

I have a Apera pc60.I need instructions on how to test and what reading should be.Keep it simple pleasr

2

Not familiar PC60 I have TDS20 and ph20. This video may help

3

Thanks for video.I need to know what readings I should have when testing runoff

4

Soil 6.5 - 7

Coco 5.7-6.3

Hydro 5.5- 6.5

Tds on run off tells you one of two things, either lower which says they need fed at higher rate or higher which means they don’t need fed as much

5

Thank you

6

Anytime

7

I have to mix and feed my plants 4 L and then 2L that I mix separately for now. So how do I figure the total PPM per feed per plant do I add them together or average them out
Ex. 890 PPM 4L
940 PPM 2L in and 1086 in the run off
So I have numbers just not sure what to do with them any help will be appreciated