i use a homemade aeroponic cloner. cost me probably 100$ all together, maybe a little more if you include the hole saws used.
method goes as this
cut clones as normal, put them into a glass
once they're cut put them all into the aero unit as quick as possible , if it takes more than 5 or 7 minutes just turn the pump on for ten seconds. I use a recycle timer , a cheap one found on ebay, and set it to an even timing (dont even know what the on/off times are)
I try to always use 65 degree or maybe 3 degrees higher temperature water
the airstones and all equipment get religiously cleaned
I take clones, change the res 3 days later (put clones into glass of water while changing res) i beleive the first res change will help get any scraps from taking cuttings out of the water
fresh water straight from the tap is fine for me, there is no chloramine in my water and adding nutes actually makes cloning take longer, and increases the risk of pathogens/anaerobic bacteria
after the clones show roots (after 7-10 days, some way less than 7 days) I do one more res change and add a little bit of root stimulator (algae extract, kelp, and seaweed extract) to encourage any type of microbial life on the roots, then I will transplant into dixie cups with happy frog when i think the roots are big enough
also wanted to add you can trim the roots off if they're growing too long and they will grow in more spots on the stem, just be careful of letting scrap roots get into the clean water.
the way i built the unit i used cleanout tee's so that i can unscrew the cap and slide a bottle brush into it and clean it
the root excel is optional and i don't really think it does anything. The best thing about this is I no longer use clonex or a medium until i know the clones are ready , and it is soooo simple.
no using nutes in the machine water , the plant doesn't have roots to uptake the nutrients anyway, and will use energy from itself (translocation) to be able to put out the roots. Once you see roots if you want you could add some nutes.
t's really all about dissolved oxygen and water temps, and keeping it sterile.