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05-13-2009, 05:29 PM #5
OPSenior Member
New to airoponics, so check this out!
So here's the update. i switched to 1/4 horse power pump ( 80lpm) which works out to 21g and some change a min. funny thing it's doesn't have the pressure my 20gpm submersible pump had but that one only had like an inch of tubing between it and the sprayers, and now that i got the timers, it's sad to think that's all I might of needed. on the other hand not having to worry about roots growing into my pump is also a plus.
so temp problem solved, except for about a four to five hour period during the day, (when the lights are off) that it peaks to 80.1f. Is that an issue or can i get away with it? not that i have much of a choice at this point. night time it fluctuate's between 74f 78f.
as far as temps go I'm happy with where im at. Now, why dose Europe and the U.S. have to have such different numbers when it comes to PPM's? if my nute solution is based on EC should i go with that or with PPM's? here a little info i found on anther there site, keeping in mind that all plants and grow environments are different.
This is PPM's for indica strains
early veg 500-600
middle veg 600-800
late veg 800-1000
early flower 1000-1300
middle flower 1400-1600
late flower 1000-1100
ripening 300-500
other info i found useful
Nutrient (salt) concentrations are measured by their ability to conduct electricity through a solution. Dissolved ionic salts create electrical current in solution, the main constituent of hydroponic solutions is ionic salts. EC= Electrical Conductivity, CF = Conductivity Factor, PPM = Parts Per Million, TDS = Total Dissolved Solids and DS = Dissolved Solids. Most American growers use PPM, to measure overall fertilizer concentration. PPM is not as accurate, nor consistent as EC, to measure nutrient solution strength.
EC is measured in: (a) Milli-siemens per Centimeter (MS/CM) or (b) Micro-siemens per Centimeter (US/CM). One Micro-siemen/CM = 1000 Milli-siemens/CM.
PPM testers actually measure in EC and convert to PPM. Unfortunately the two scales (EC and PPM) are not directly related. Each nutrient or salt gives a different electronic discharge reading. To overcome this obstacle, an arbitrary standard was implemented which assumes "a specific EC means equates to a specific amount of nutrient solution". Consequently, the PPM reading is not precise at all, it is only an approximation, a ball park figure.
from what i've been able to gather there's a 40% difference between the US and Europe PPM's. so is it to be more american that i should go with US calculations or is there an actual logical reasoning for this?
i bought the truncheon PPM meter and was confused as hell about what to do next, so this is where i'm at and it took forever for the boards to get back online.
according to my meter my well water is at 560 US PPM's and 400 EU PPM's which is to high as far as US ppm's. the Aqau Flakes system I'm using says i should start at 1.2 EC and end at 2.0. So how do i make a decision with such a differnce in the information?
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