Hi buds! Sorry there hasn't been much interested shown in this thread OP, but I have been scavenging the internet for HPA growing information for months and would love to collaborate with you.
I have a couple very important questions, first what on/off time intervals are you using? How have you been changing the intervals as they age? Have you cloned with the HPA system? And finally why do you use air stones?
My understanding is HPA is exceptional because of the smaller droplet size and constant air around the roots where/when there isn't water. This allows short on times and long off times for the roots to absorb the small droplets and aerate, creating root fuzz. And with a high pressure pump (guessing you are around 100psi), I'm not sure the airstone in the nutrient reservoir would help, it might even hurt the pump imho.
I have been flirting with 3 seconds on/3 minutes off but think I need more on time during early development. I am currently only using the HPA system for cloning and veg but plan on integrating it into an undercurrent like system as a "top feed" option for roots above water.
I am also still looking for the perfect placement and angle for the misting nozzles (ruined at least 2 totes but now I have a guinea pig for future tests). My 1GPH nozzles seem to have a pretty tight conical spray and it doesn't seem perfectly spread throughout. Currently running 3 or 4 misters per tote with 2 or 4 of them on the corners pointing toward the middle of the tote.
I hear great things about the "cheap" aerocloner which seems to just constantly spray low pressure water so I have been thinking about greatly increased "on" times for cloning and veg.
/scattered thoughts rant over
Love the community here and most places I visit, keep it mello 420 gang!
Yeah I haven't posted here in a while I have a more active log of this grow on a different site.
Timer intervals, my current interval 2 seconds on, two minutes and 45 seconds off. There is no set standard for the timer intervals it varies from Plants sizes always down to plant genetics. If I start from seedlings I normally go three seconds on and 2 minutes off. As they grow bigger eventually switch it from 3 seconds on to two seconds on and then the off time moves from 2 minutes off to 2:15 to 2:30 to 2:45 to 3 and so on and so forth. You'll need the timer that you can set multiple intervals at different times of the day. For instance sometimes I'll have my timers run at 2 on and 230 off during the day for 14 hours and at night I'll have it for 2 on and 3:30 off for 10 hours. They even have timers that automatically flip from day to night intervals via a built in light sensor. Pretty dope.
My pump has a bypass that caps out at 125 psi, but my nozzles have a restricted flow rate that keeps it as 50 microns. The microns are what's key when growing aero. You might have a high pressure pump but you could have inadequate nozzles that are too high or in some cases too low in micron size. The more nozzles you have per tote
The better. With more nozzles you can decrease your on time and increase your off time. I'm currently running four nozzles per tote two on each side. You can built your own aerocloner for very cheap and they do work very well if kept maintained. If you run the pumps 24/7 it's basically just a "glorified" hydroponic setup.
I'll try to get some pics up later today of the girls. They've ran into two huge problem in their lives. The first one, happened about a month ago. I let the reservoir run out of water on accident and they completely wilted , right in the beginning of the budding stage. They recovered somehow and kePT on budding, then with all these major storm weve been getting hit with, I was out of power for over 72 hours. I had to manually feed my plants with water to keep them alive, it was brutal. But we've survived and they're still trying their best to bud out