ppm reading squeezed out of rockwool

[SYROUS]

okay so i squeezed a rockwool cube that i pulled a plant from into a cup and tested ppms were 1300+ is this a good reading or higher cause some of the rockwool floating as well,im starting the flush now anyways just wondering for future reference if i should do seperate tests form the medium itself

 

[motherlode]

whats your ppm that you feed with?

1300 is high if your feeding with say anything up to 1100

but its fine if you feeding with 12-1400

 

[SYROUS]

the res is 400 now nothing ,thats what i am concerned about if that high reading is coming out of the medium when what im feeding them is low like 400ppm, i burnt as u know this round and dont want it to happen again,but also the cube i pulled the reading from didnt have a plant in it for a couple weeks but i left it there cause all the roots from the plant beside it ,so maybe it just build up ,fuck im babbling now ill check back when i can focus i love weed