Plant problem....

yah there is rockwool in there.... ill take care of them asap... i can not see the salt build up... whats it look like?

EDIT: i just flushed the rockwool with the water that was in the reservoir... plus i think i screwed my ppm meter up by not calibrating it right... i dont know the temp of the calibration solution so i can not calibrate it

the salt build up is the white residue on the net cups and probably on those rocks. your ppm meter should automatically calibrate the temp range. u have a link of the ppm pen?

here is my ppm meter

http://www.eseasongear.com/ppmmeter.html

and this one is my ph meter

http://www.eseasongear.com/phtester.html

I see the salt build up now... what can i do about that?

says in ur manual:

TDS Meter General Usage and Calibration Instructions​

Proper Usage​

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accommodate the proper compensation.

so I think the temp is calibrated internally. I think with what u posted earlier it is calibrated. as for the salt on the cups, more of a point I was making if that much was on the outside of the nut cups that are probably getting wet, imagine what's inside your rockwool. to clean it, just wipe it down with paper towel and some windex or fantastic or something similar.