SOLVED, SEE:
https://www.icmag.com/ic/showthread.php?t=332696
After 2 years battling root rot, I compiled some knowledge about "sterile" RDWC growing. Please, feel free to correct me.
Please, no "get a chiller, temps are high, more oxygen etc." comments. I have perfected everything, even overkilled ALL technical aspects already.
Using tea for last 4-5 grows and still got problems. And I did my homework about the tea and exhausted all possibilities, even adding it daily at stupid amounts. It did help some, though.
So, here is my "sterile" findings:
-Using Chlorine(bleach) or H2o2 is USELESS without ORP/redox meter AND some sort of automatisation to hold your target levels. ORP levels (in mV) tell you how much of your disinfectant is actually doing the dissinfection.
Example: I have put bleach in my infected system, calculated amount to reach about 2ppm. After 1min there was NO active chlorine in the system. Ended using 50x(yes!) the calculated amount to reach 2ppm!!!! And currently still using 5-10x the amount to correct the levels. Here is the answer, why many people claim, that bleach/h2o2 does not work.
- OPR/Redox potential in mV used for dissinfection is from 420mV-800+mV. Beware, colerration betwen mV and ppm of active chlorine is heavily depended on pH!
700+mV will kill everything, but hopefully not your plants. at least 500+ is reccomended for keeping the res clean.
-In case of using Physan (or hydro-fungicide - I think it is very similar) does not produce any ORP levels. Basically you are adding it blindly. (You shold add it every 3-7 days)
- Using pool shock is I think better, as it is calcium compound vs the normal bleach, which is Natrium based.
SO HERE IS MY PLAN:
- I bought the ORP controller on ebay (careful, some have very limited range of control)
- I plan to run the system with pool shock, stable at around 650mV, which is about 0,5ppm at pH 6.
- occasionaly will shock the system with 1,5ppm active Chlorine (around 800mV)
-Thinking of running my 2nd system with physan, 1ml/10gal every 3-4 days to compare.
Any thoughts, comments, questions?
Thank you!
https://www.icmag.com/ic/showthread.php?t=332696
After 2 years battling root rot, I compiled some knowledge about "sterile" RDWC growing. Please, feel free to correct me.
Please, no "get a chiller, temps are high, more oxygen etc." comments. I have perfected everything, even overkilled ALL technical aspects already.
Using tea for last 4-5 grows and still got problems. And I did my homework about the tea and exhausted all possibilities, even adding it daily at stupid amounts. It did help some, though.
So, here is my "sterile" findings:
-Using Chlorine(bleach) or H2o2 is USELESS without ORP/redox meter AND some sort of automatisation to hold your target levels. ORP levels (in mV) tell you how much of your disinfectant is actually doing the dissinfection.
Example: I have put bleach in my infected system, calculated amount to reach about 2ppm. After 1min there was NO active chlorine in the system. Ended using 50x(yes!) the calculated amount to reach 2ppm!!!! And currently still using 5-10x the amount to correct the levels. Here is the answer, why many people claim, that bleach/h2o2 does not work.
- OPR/Redox potential in mV used for dissinfection is from 420mV-800+mV. Beware, colerration betwen mV and ppm of active chlorine is heavily depended on pH!
700+mV will kill everything, but hopefully not your plants. at least 500+ is reccomended for keeping the res clean.
-In case of using Physan (or hydro-fungicide - I think it is very similar) does not produce any ORP levels. Basically you are adding it blindly. (You shold add it every 3-7 days)
- Using pool shock is I think better, as it is calcium compound vs the normal bleach, which is Natrium based.
SO HERE IS MY PLAN:
- I bought the ORP controller on ebay (careful, some have very limited range of control)
- I plan to run the system with pool shock, stable at around 650mV, which is about 0,5ppm at pH 6.
- occasionaly will shock the system with 1,5ppm active Chlorine (around 800mV)
-Thinking of running my 2nd system with physan, 1ml/10gal every 3-4 days to compare.
Any thoughts, comments, questions?
Thank you!
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