PH for organic coco grow?

I recommend using filtered water if you're able to over tap btw. There's nothing wrong with using better water

6.2- 6.8 or just aim for 6.5. look at the nutrient absortion chart for a better idea of what's being absorbed at what pH and that can help you dial it in even better for different growth stages

Just use ordinary tap water, there is no need to use RO water and definitely DO NOT use distilled/de-ionized/de-mineralized water. In coco, a pH range between 5-8 and 6-4 should be just fine. Cannabis is a hardy plant and does not need "Pricess Perfect" conditions to thrive............it ain't no dainty fern! In coco, no matter what nutrients you are using, you MUST get run-off EVERY time you irrigate. You will also need to use cal/mag regularly. The use of mycorrhizae is also something I can highly recommend...........it should be an essential ingredient in any grow!

What you’re asking about is an interesting topic. Many organic growers feel too much pressure regarding pH. Cannabis can grow in environments with pH ranging from 5.5 up to 7.0, which is considered neutral. However, I believe the real issue isn’t your substrate’s pH but rather its organic matter and the micro-life you introduce. My recommendation: Use a 70/30 mix of coco coir and pure worm humus, and add mycorrhizae like Great White Shark. The humus and microbes will create an environment where the plant depends not on the water’s pH but on its microbiota. Just make sure to always use dechlorinated water — either distilled with added CalMag or deionized.

Sounds like the bio tabs are ph-balanced on their own, so i woudln't fiddle with it unless you find a reason to do so. If bio tabs are ph-buffered and balanced, i wouldn't worry about RO. RO is more susceptible to ph-drift, simply due to the lack of solutes, which is also a good thing in other respects. If you see it wildly swinging around, then i'd consider using tap water - see if that fixes the problem. You can measure runoff, but it's never precisely representative of what's resulting around the roots. So, this can be good info / good practice, but only after you form a baseline (famiiar) with what is normal when the plant is growing well and healthy (over a long period of time, and not a snapshot). Then you can discern when the readings from a flawed measurement process is worth reacting to. You can do a soil slurry - again, needs familiarity to be more useful information. how you measure will impact what you see... be consistent when you measure runoff (early runoff will measure differently than later runoff) or how much you use in a slurry and the ph of water added to start etc... Yes, 6.2 is a good goal, but the reading of runoff is not what exists around the roots more times than not. hell.. if your tray is dirty with dried up nutes it'll potentially fuck up the reading too. i know someone using biotabs and seems to be a complete diet on its own. Shouldn't need to do anything else. Seen others with different results, but that was probably user-error. Keep it simple. don't try to do too much. Get things running smoothly, then add more "sophisticated" wrinkles if you want.

I have never use coco, i am growing bio in soil although i have much experience with bio tabs products. I am using them 4 years now. No need to adapt ph, i have never done it. I water with tap water. If you use Starttrex, Tablets, Bactrex and Myccotrex, microorganisms will adapt the ph of the soil. I never had problems with that. The yields are also very good. I repeat that this is my experience in soil. Good luck!

6.2 is good idea. give you a bit of wiggle room. 5.9 is to low if it goes lower your entering lockout range IMO. Coir its self is around PH 7. I have grown with amendments and always aim 6.2-6.5 to low and it gets weird. If you don't have a good brand of coir it needs to be rinsed and buffered, can google this if you are unfamiliar with the terms. I like CANNA brand as they treat it well. You will also want at least 30% perlite in the mix as well. The coir you get a homedepo for 9$ is the stuff u gotta worry about. Useing RO water is not great. save it for drinking. RO will also damage your PH probe, their needs to be something in the water or it becomes very aggressive and will eat away at things. its why all RO taps use plastic pipes, only thing that will not degrade. If you already set on it. Don't PH probe the water, just add in a bit of PH down, it will have issues reading it. Same with PPM/EC pens. pure RO fucks em up. Try not to use metal items and only plastic as well. Biotabs look a lot like dry amendments but in little pills. You will want to not get any runoff with em to avoid leaching the soil. but with coir a bit of runoff can be good. Might need to schedule a flush from transition of veg to flower to avoid any issues. Microbes will be your friend boost the medium with tons of them if you don't already. Amending in moretabs might be difficult with think root base, can try blending them up and into the water then in. I like using wetting agents to break surface tension of water. Yucca is one such one. Water in slowly to avoid dry spots. Good Luck!

Organic grows in coco 5.9 and then allows the pH to drift between the upper and lower ends of 5.6-6.4. This is optimal for the microorganisms and will keep hydrogen activating in the medium, critical for organics.