I just got 100% clarifying answer from ADN : Hope it will help someone who have DWC
Hello advancednutrients.com,
I have a question for you, would your ph perfect formula work with RO water? I really would like to use your nutrients line if it does what it should do. And would I be able to use
http://www.advancednutrients.com/hydroponics/calc/ without any issues or for RO water there are some other measurements needed.
Hope to have your answer in the coming days.
Thank you in advance for your help and assistance,
With kind regards,
ko
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Simply mix the nutrients as recommended and feed your plants throughout the week.
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However you didn't answer my question, maybe you didn't understand it correctly,or maybe I didn't understand it correct, I will try to explain. I have read this pdf :
http://www.advancednutrients.com/ph-perfect/pH_Perfect_Efficacy_Report.pdf. But there is nothing said about DWC(Deep water culture system) see image of my system
http://www.hydroponicist.com/hydroponic-systems/images/aero-pod-bubbler.jpg .
This is not the way my system works, plants are constantly immersed in the nutrient solution the whole week sometimes longer. The root system is 24/7 in the nutrient solution
Excuse me for misunderstanding, hope you would be able to help me,
Thank you for your help and assistance,
With kind regards,
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When we said “feed your plants throughout the week” this means constantly in DWC or Drip System etc, apologies for the miscommunication.
In your DWC system, you will mix nutrients following our nutrient calculator, changing the reservoir every week.
If you need to add more nutrients throughout the week, please top up using the pH perfect base nutrients at 2ml per liter.
Dimitar P < @balkanplantscience.com>
8:26 AM (4 hours ago)
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Dear ko,
Please, find below the answers from your scientist:
“I have a question for you, would your ph perfect formula work with RO water? I really would like to use your nutrients line if it does what it should do”
-- Answer: pH Perfect works best with RO water.
“And would I be able to use
http://www.advancednutrients.com/hydroponics/calc/ without any issues or for RO water there are some other measurements needed?”
--Answer: You can use the calculator without measurements. However, don't throw out your pH- and EC-meter

They can show you if something wrong is happening with your RO system (we had such an accident in the research greenhouse). Moreover, measure from time to time the EC of your solution. Depending on the variety you grow, EC should be between 1800 and 3000 uS/cm. If EC is going too much up, add a little more water. And vice versa. Unfortunately, best results can be obtained only after some experiments with EVERY variety you grow. This applies to all base nutrients on the market, not only pHP. Different varieties have different preferences to EC, however, they grow best within the same pH range we guarantee
++ Feel free to share your experience with pHP. The System was tested by many growers but every specific case is important to us.
Regards,
Dimitar P
Sales Manager
Balkan Plant Science (part of AN)