Just an update - my modified cooler aerocloner is working great!
I have about 20L of water in it. I put General Hydroponics Rapid Start in the reservoir at the recommended dosage.
The pump is on a timer and runs 15on/15off 24/7. There is a T5 Sunblaster over the cloner with a couple small fans (indirect). It is in my veg room and runs at around 26C & 65% RH.
I have the water PH'd to 6.0. I check the PH daily, and usually it requires adjustment DOWN of 0.1 to 0.2.
It took me a little bit to figure out how to keep the Ph dialed. I also had the drain hole start leaking after a couple weeks, so I took it apart and sealed it with glue.
So here's my most recent run.
These were cut on August 15. There are two strains here - Jordan of the Islands Blackberry Mouth & Rare Dankness Somali Ghost Train.
When I took the cuttings they went immediately into ph 6.0 water. Then before putting them in the cloner, I took some leaves off. I made a new fresh cut at 45degrees AND lightly scraped about 1" on one side near the bottom of each. I *did not* use any cloning gel or rooting powder! (In the past I noticed the spray from the nozzles just washes it away quickly, and also seemed to contribute to the res getting dirty faster, so I figured I might as well try without).
First signs of roots on Aug 22 (Day 7)
Obviously starting with healthy plants helps (see photo), but I've had success in here with some more delicate cuttings from a friend.
100% rooted as of today Aug 25 (Day 10). Total 16 cuttings.
I understand that genetics and other factors can play a role. Maybe this is some beginners luck. Also perhaps 10 days is too slow for some? From my point of view, so far so good, but I look forward to suggestions for improving my process.
I suspect I could get the cloning gel to remain stuck if I replaced the nozzles with something that creates more of a fine mist, but I am not sure I can see a compelling reason to bother.