Hey, I just had a quick question. I finally got my ec/ppm/ph meter up and running and wanted to know how EC ='s ppm? I am pretty sure my meter only does PPM, I have this model here;

https://www.bustan.ca/product_detail....&SID=23&PID=83

Up until now I have been going strictly on PH and the force, but some of my girls have a bit of burn so I want to know the full story!

Anyways, I know there is some kind of conversion factor involved in this, I believe my meter is set to .5 currently. Can someone give me some pointers on converting my EC readings to PPM readings? Thanks guys

[pontiac]

its all just a form of reference for you really. The real advantage a tds/ppm/ec meter gives is only seen over time. If your tds/ppm/ec is rising over time, your nutrient is too high. The plant is taking in more water and leaving excess nutrient behind making the concentration rise. If the tds/ppm/ec levels drop over time that means your nutrient concentration is too low. The plant is taking in more nutrient than water and the concenration drop. What you want to see is a constant tds/ppm/ec reading. This means your plants are taking in and using the nutrient at the same level as they are water. When this happens the water level in your reservoir will drop but the tds/ppm/ec levels remain constant. It is obvious why this is most beneficial scenerio You want to avoid having to add nutrient or water if you can. When you get her there....you gotta ride it. Its like a wave. When a system is really dialed in you can go a whole run without res changes...



On a another note...I think everyone should use ec. There is no conversion factors...no chance for confusions or miscalculations. Ec is ec is ec. Just my 2 cent

[AbaZabba]

Good chart pontiac, seems to be very useful if you have any of those brand pens hehe.
The problem I'm facing is finding the EC for my Sunleaves ppm pen, it does not read EC. I received this pen as a gift and really like the ability but was curious if anyone knew the conversion for EC to PPM with this meter?

the model is:

https://www.sunleaves.com/detail.asp?sku=STD500#

If anyone has an idea what the conversion for this pen is that would be greatly appreciated. If not, o well i'll still use it and keep it @ ~900

[pico]

I second Kokua's motion to use only EC. The ppms pens should tell you the conversion on the unit at least.

Nothing worse then a .7 conversion guy telling the .5 conversion guy how high to run his nutes. 1400ppm @ .7 conversion is EC 2.0 1400ppm @ .5 conversion is EC 2.8


Or better yet, just get a Blue Labs Truncheon meter. It is the best meter I have ever owned. It displays EC, CF, PPM .5/.7, TDS. It just has a series of lights at an accuracy of .1 EC. Very easy to read.

[Moppel]

thnx pontiac. but quiet confusing , different ppm with different meters.

[pontiac]

Its important to note that ALMOST ALL AMERICAN MANUFACTURERS uses the .5 Conversion factor by default (if the meter only measures tds). Which means that HM DIGITAL, HANNA, MILWUAKE, OAKTON, SUNLEAVES etc. uses the .5 factor. Most Euro models uses the .7 conversion factor; i rarley see the .64 conversion factor in use. Hope this helps.

Great chart Pontiac, thank you very much!

Hey Kokua, thanks for the info! At the present time I am hand watering on a daily basis with 2-3 different nute mixes between veg and flower. In the future I would love to move to a res and drip system but it will require a bit of a re-design as my current grow space has no room for res's and no way to deal with run off. I will have to do something sooner than later though, the wife is not happy about us not being able to go on vacation because the plants need to get water'd

I got my meter out and up and running @ the .5 conversion rate, things seem ok so far, I will be into my flower cab right away to see how yesterdays nutes were received, @ about 1.3 EC in week 3 of flower. Thanks guys!

[gaiusmarius]

Originally Posted by pico

I second Kokua's motion to use only EC. The ppms pens should tell you the conversion on the unit at least.

Nothing worse then a .7 conversion guy telling the .5 conversion guy how high to run his nutes. 1400ppm @ .7 conversion is EC 2.0 1400ppm @ .5 conversion is EC 2.8


Or better yet, just get a Blue Labs Truncheon meter. It is the best meter I have ever owned. It displays EC, CF, PPM .5/.7, TDS. It just has a series of lights at an accuracy of .1 EC. Very easy to read.

so true, that is why one should be very careful about telling another grower what ec to use. i tend to talk about ml of nutrient per lt if i want to be very clear.

it's a good chart though

i need to print that chart out thanx