EC and PPM

perfect! Thank you!

P

And at the bottom of that page.....this link.

Bluelab : Measurement Conversion Chart

Quote:

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Originally Posted by piglet420

I just put together a new batch of nutrient and the PPM reading was 762 and the EC reading was 1525 with the water temp at 61C. Yes I know the water temp is cold, it's cold out in the garage (lol). With those readings, does that help me guess what I should be reporting or using as a feeding schedule? The Botanicare bottle says 600PPM...so I need to cut the nutes down with RO water, or is that not an accurate reading? Should I be using the EC? I can't find an EC conversion scale for the nutes I'm using? Any suggestions?

P

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A reading of 1525 is the same as 1.5, it's the units that vary. 1525 would be 1525 µS. You said it read 762 for TDS, which is half of the 1525, so your conversion factor is 0.5. This is also why it was reading 1200 PPM when you wanted 1500 PPM.

I researched Botanicare to find what conversion factor they used for TDS and found nothing. I would e-mail them and just ask for the EC numbers or what conversion they used. You can also just use the recommended nutrients by volume.

Weedhound is an experienced grower and uses Botanicare. There is a whole post on the Botanicare regimen. http://boards.cannabis.com/hydroponi...ml#post1789167

Thanks folks so much! I'll be doing all the reading tonight and get it squared away. Not sure how to give rep points or props. If you show me where it is in the forum I'll make sure to give some to you both.

Thanks again!

P

Quote:

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Originally Posted by piglet420

Thanks folks so much! I'll be doing all the reading tonight and get it squared away. Not sure how to give rep points or props. If you show me where it is in the forum I'll make sure to give some to you both.

Thanks again!

P

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All you have to do is click the little blue scale icon on the top of an individual post. If you hover your mouse over it, it will say 'Add to Nickname's Reputation'.

I just wanted to let you know that I replaced my res. I'm going to start measuring using EC because I keep getting told that's the best way to measure the res content. Additionally, I have a scale that converts the EC with the manufacturer of my meter.

With that said my EC is now .670 which measures between 300 and 350 PPM (roughly 325). My ph has been constant at 6.0 for the past 2 days but I'm going to bring it down a little just for arguements sake cause it seems most people like 5.8.

My leaves on that one plant still seem turned up, no discoloration on the leaves. They look like "canoes" is the best desription I can give. A book that I have mentions magnesium defeciency, but I am no authority on this.

I'm going to give it a few more days and then change the res again.

Today is day 13 of veg.
EC is .670
PH 6.9
Temp 75
Bot Pro grow and Liquid Karma
Light is MH 400w about 20inches from canopy and running a fan

P

Generally the already affected leaves won't repair, but it might stop from getting worse and new ones won't develop that syndrome. So don't try driving by the appearance of those plants. Just let time and your new solution do its thing. Don't change water for another week.

Will do and that's the general feeling I had as well.

Thanks!!

P

Well today is the 5th day of the new res. Something I have noticed over the past 2 days is that the color of the liquid has turned from that "nutrient brown" to almost clear. Obviously the bottom of the res has some of the coloring from the settlement of the nutrients but I stir 2 times a day to make sure I keep everythng moving about. I also have 2 large round air stones on all the time in the res to make sure there is circulation and more oxygen. The other thing I have noticed is that they are using more res solution and I had to adjust my PH 2 times yesterday and once this morning. I guess my question is, is this normal? Is this how I know they are using the nutes and is it a good indication that I need to add more solution to the res. I'm still keeping it at about .67 EC as everyone previously suggested and they are getting really bushy now.

P