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Yes that is true. I feel like I am confusing the point here, but if you pour it on something that it can react with, it "burns up" faster than if you just pour it in a clean glass.
If you have 12 gallons, that is 45L.
1ml/l = 1000 PPM
1000 ppm / 12% = 83PPM up when you add 1ml/L
x/.12 = 5, solve for x = .6ml/L to raise to 5PPM
so 45L (your system) needs 27 mL of H2O2 to raise 5PPM. Less if there is already H2O2 to start with in the system.
There are 3785 mL/Gal, so you have 140 doses. Only 52 weeks to dose. The rest you use for cleaning.
And to your point, as the peroxide ages, you might have to add more per dose as time goes on.
PH after adding peroxide and well stirred, last step in any nute regimen is PH check.
This is awesome, thank you. I'm absolutely worthless when it comes to the most absolute basic of math. I have trouble adding 1 and 2, don't even get me started on trying to do division and multiplication. I will try to go H2O2 this round.
Im going to say this. . once u figure out how to prevent it. The rest is gravy. My shit can go unattended for a week if needed. Im sloppy. . i dont use any corrosives ever, just put the parts in the tub and scrub them with the lufa, hott water and whatever bottle of shampoo or body wash is close. . rinse good so the smell is gone. Basically. . im sloppy, messy, im lazy, and I enter my grow room about once a week. I get some issues up top from running them outta nutrients. . or adding to much. . but as for root rot. . even as care free as I am. . i still havnt seen it in over a year. I use microbes. . aka hydro guard and only add it at the start. Somehow my colonies stay active the entire grow. . plus i do 0 res changes. . only top offs. . anyways ive learned alot on what not to do. . still dont know how to do it perfect. . but i will soon enough. Good luck bud, your in good hands at the farm
That's been my goal throughout all of this with this system - I've been trying to design and build a fairly automated system that requires minimal amount of work, and just let it do it's thing. The 5gal bucket I limped through on round one "worked" but ... it was a nightmare of constant instability. I was always having to deal with adding water, mixing nutes, adjusting the ph, etc etc etc etc.
After dealing with that, a larger RDWC system seemed like it would solve the majority of my problems, and so far with things like PH, nutes, drain/refil - it has! I just have to figure out how to get past this damn root rot in the netpot issue. It still blows my mind people are able to get through grows with zero or minimal res changes. This system was designed to the best of my ability, but it's too rigid. Lesson learned - I already want to tear it apart and make a new one, but ... I've got too much invested in it and need to at least see a grow through it at this point before I work on the next design, but ... I absolutely do want to make the next one more modular and able to be better dissembled to clean. I was so worried about potential leaks this time, I went overboard with trying to make everything as 'one-piece' as possible. Seemed like a great idea at the time to not flood my floor - however now, it's had the inverse problem of being difficult to clean.
Hopefully I'll get there eventually. I'm sure once I do, I'll undoubtedly run into a whole new batch of problems revolving around nutrient related issues, overfeeding, underfeeding, deficiencies, light being too bright/close/too far, etc etc etc.... but, I have to get the plants beyond 2 weeks before I have to worry about those problems.