Lucas formula PPM?

OK looking into this I think I see what is happening to you. The GH Calculators' PPM is in reference to a .5 conversion factor and the PPM also reflects the use of the liquid Koolbloom which adds 350 ppm.(EC of .7) To confirm I whipped up 1 gallon RO with 10ml micro and 20ml bloom and I got 990 ppm. Add 350 for the Koolbloom (the label states 2 tsp or 10ml = 350 ppm)and I get 1340 ppm. Real close to the stated ppm level.

The calculator set to agressive is Lucas in the sense that the Micro/Bloom is a 1:2 ratio, but is is NOT lucas in the dosage. Lucas is 8 ml micro and 16ml bloom per gallon so the calculator is off by 20% in the dosage (using LUCAS as the desired dose).

So 20% dosage error and 20% meter difference (because you have a .7 meter) is what you are seeing (60% of 5 gallons = 3 gallons)
Traditional LUCAS calls for 40ml micro and 80 ml bloom for a 5 gallon mix (8x5 micro) and (16 x 5 bloom) for a EC of 1.894 (1326@.7 and 947@.5)

You'll love the lucas formula..It seriously works.

Also, when your in veg mode, throw a lil Superhtrive in da mix.. a drop a gallon.

Makes a BIG difference in the root mass.

Hey all I just wanted to clear the air about my earlier comments. After talking with patipp we figured out that my meter wasn't working properly for one I hadn't cleaned ever cleaned it in four months and I believe I was using the wrong calibration solution for my meter.

Anyway after cleaning it and recalibrating my meter is working perfect and jives with the website using a 0.7 conversion.

Sorry for any confusion.

Also + rep to ya patipp

Peace

Koi2Dragon said:

Hello
I am a first time hydro grower and I am planning to use the 2 part Lucas formula in my DWC (5 gallon bucket) set up.
I am trying to understand what PPM is and what it should be while growing?
What is an ideal PPM number at any given time in the grow process?
Any help is much appreciated.

Click to expand...

should be between 1300-1400 ppm means parts per million..A measurement of how much nutrient is in the water.