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I've used pH 10. It doesn't do anything bad.
Optimal is actually 7.5- 8. Bacteria doesn't do well in alkaline conditions for the most part. But I haven't noticed anything out of the ordinary when I've added too much lime.
Three A+ jars were definitely 100% colonized. Shook up the jars and mixed each jar of mycelium with 3 jars of field capacity substrate balanced to 7.75 Ph consisting of coir and spent coffee grounds PC'd for 90 minutes last night. Paid attention to get a good mix into the corners and edges then leveled the surface as best I could. Put the three 6 qt. tubs into the IC (Incubation Closet) and will try and maintain 78-80F for the next 10 days. I will add a casing and put them into fruiting conditions on 5 May to celebrate Cinco de Mayo. This will be my only chance for shrooms in May. Starting another grow this weekend for June.
So yah, I went shopping...in the cheapest place. Alibaba you failed again.
Past experience has shown me that some third world countries are competing with tech from ...more advanced countries when it comes to tech. Don't get me wrong. I had a Hyundai luxury car xl500g IIRC. Fantastic car! Loved it. AC worked before you left the driveway in 110*. Heated seats for the cold desert morning, power everything. 🤩 But I let it go when too many things went sideways. Ended up being a battery. I know what you are thinking. Useless mechanic , can't fix his own car. Well when is the last time you were in a plumbers house and didn't have to jiggle the handle or a roofers house with a good roof? Anyway since I am not a scientist I was unsure of all parameter concerning a flowhood but went shopping and found the gold mine for budding mycologists. H14 24x24 filters for $52 each. Shipping set you back further but still at a total cost savings. I almost hit buy then did more research. 70 mm thick. IOW not much more filter power than the 3m filtrete we know works. I wanted a true laminar flow. The sellers swore up and down their filters provided that. 70 mm vs 11.5 in. You do the math. The kicker is that with shipping, the other(thin) filters were slightly more expensive than the one recommended by multiple commercial growers. I did not make the mistake. Moral of the story is make damn sure you know what you need to save both money, time and heartache after failure.
Sorry Mp, my phone is off it's axis. Just saw your question.
You wait until pH stops changing. I know that isn't very helpful, but adding more of acid or base until you have a stable reading will cause you to overshoot which is what I think happened to peg your meter.
I used a cool midt many, many, ah hell too long ago to count, on cakes. I didn't want anything adding heat to my makeshift prehistoric Martha residing in the SW desert. Imagine 1/2 A frame built from styrofoam insulation board with sheet plastic covering the open front. Those were the days.
See I asked about this before about coir thinking it was structure and was told coir is slow nutes. I would say let's get our ducks in a row, but would hate us all chasing the wrong tangent. Perhaps some collaborative testing? Just not sure how to go about it. Any ideas?