everyones about PPM these days..
"TDS- Total dissolved solids" tells us how pure our water is. The measurement that calculates this is "EC - Electrical conductivity", which is then converted into a measurement called "PPM - Part per million"
Now
"PPM = parts per million" has 3 different tables that it references
You dont know which table your fellow grower is advising you to follow unless he specifies(2 posts on this thread were a suddle exchange of this info).....or its with the EC measurement since it is Universal. Even then its still not dependable in all cases, for example lets say you are getting water from a well with minerals. Those minerals might mean little to your plant but your ppm reading is saying 8000PPM!!! Well your plant should be dead right? Wrong
Let me show you a plant grown in 8000PPM(.7), this baby was only 2 weeks old
Not perfect but none the less, healthy. Not saying to try this but just saying there are many variables.
Now that I got that all cleared up let me take a drag
Not saying to drop your ppm meters at all. If your familiar with it and with your water source, or even better yet you have a reverse osmosis system you then can get an idea how much nutes you have in your water. I would prefer EC since its one value for all EC meters in the world.
Now im going to say something thats not in the modern day 'Forum' text book............. listen to your plants.
Start small with nutes and slowly work your way up, start seeing burn on your tips then back off, wait till all is good again and add a bit more, Find your strains potential. Some genetics can take more then others.
so when someone says use so and so ppm, Dont listen. Listen to your plants instead, they will tell you. On this note tread lightly (start small)
Oh since your going to use your tap water ask for a water report from your city, they will give to you for free. Chlorine needs to be aerated out.
Cheers from Canada