sorry for the spelling and grammer I just woke up. had a late night. I know you will have many more questions so fire away and you will get some good help from the peeps here. You might want a good book too like the indoor grow bible. do searches and read all you can. Give as much info as you can when asking questions. Tell us what your setup is and how much room you have. If your meter only shows EC (eletrical conductivity ) Then you need a conversion chart to tell your PPM. TDS (total disolved solids). Working on my second cup of coffee, time for the morning buzz, oh hell it's almost lunch I missed it. LOL Now I have to catch up. If you can show us some pictures, my thread is the red hair ladies down the page.