make sure the solution is properly mixed.
 

Hi Ron, Frequent reader, second time poster. I built a 6 plant system, with 15 gallon reservoir, 70gph pump, everything seems to be working just fine, (used silicone sealant to stop any pesky leaks), I haven't added my clones yet, although, I added my solution yesterday and have been running the system every 30 minutes. I am almost afraid to put my babies in the system in fear they will die! I just want to make sure the solution is properly mixed. My ph is around 6. I followed the directions (3tbl per gallon) on the nutrient solution, however, I want to make sure the tds ppm is correct before transplanting. Is there a way I can check that without spending $80+ on a tds meter, or am I just being too paranoid? Any help would be gratefully appreciated. Virginia420

With pH their is a cheap way with drops or tape but their is no cheap way with ppm.