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I would use an ESP32. You can connect to it with your phone either with wifi or bluetooth. Hook the ESP32 to a stepper motor/drive unit, maybe a geneva mechanism if you're worried about the motors drawing power at idle. You should also have enough pins on the ESP32 left over to control your...

Not sure if running a handheld over the plants every couple of days is enough. I ran 20mw of UVC in a 2x2ft space for about an hour a day. If you over expose the plant it will look like this. If you see that on the top most leaves, just dial back the exposure.

If I recall correctly from my aquarium days, the amount of dissolved oxygen in water is independent from the amount of dissolved co2.

I'm also interested in getting some new strains into my mix. Any updates with this?

Thanks for the reply. I'm using the calmag to flush coco coir to check how my buffering is holding up. The plant is doing great so this is more curiosity than an issue.

I've been mixing my own cal mag after this thread. 7.5g calcium nitrate to 500ml of water 4.5g magnesium sulfate to 500ml water add mag water to cal water I add 50ml of this to 1 liter of water to get 200ppm ~7.4ph When I add ph down (diluted phosphoric acid) I noticed that the ppm drops down...