I love my autopot system. I was a chronic overwatering grower and now I just fill a reservoir. PH and TDS it right and stuff grows better. Autopot system is like hydro for dummies or people like me, over waterers.
In my experience hydroton for 2 inches or so on the bottom and 50-50 coco perlite mix works the best. But 1 to 2 inches of hydroton is essential to make it work.
I have tried coco-perlite coco- and 1 inch rockwool and 33% of each. The coco and perlite work the best.
Currently I am using hydroton and coco and rockwool cubes because i have a lot of each.
I currently have 4 pots and 2 reservoirs so I can get things dialed in depending on what is growing. Running a single autopot in a tent and 3 in a 4 x 4 currently. Get them from bustan it is the cheapest ever and about half of what i paid for mine.
Rules to autopots...
get RO water. Start that shit at zero ppm
GET A BLUELAB PH PEN... trust me this is essential
Add calmag to your RO water first and then put the nutes in after you add about 150ppm calmag. Thus the bluelab penNute it up. Autopots love the GH line of nutes. Old school trio with some root stuff some floralicous plus and such.
GH trio is my preferred because of simplicity. (grow/bloom/micro)
I use the GH schedule. 1/2 strength at seedling and a watchful eye with a beercup and coco. I started organic and found coco is better in tight situations
I add floralcicous plus and liquid koolbloom. Get small bottles of these they are 1 or 2 ml per gallon. So a quart lasts a really long time
Make sure you run an aquaruym pump in the reservoir to stir shit up and avoid bacteria. I run a timer so 15 minutes every 2 hours it churns. TRUST ME THIS IS PARAMOUNT AND CHEAP
Grow the babies until they are seedlings. Start them in beer cups (USA = solocup) then put them in autopots and feed them manually for a week or two. And then turn the reservoir on and you will say GWHEELS is the shit. allegedly