Here's my successful 30 site DIY bubble cloner. I used a 15 gal Rubbermaid Roughneck tote, cut 2 " holes in the top. I filled the 2" holes with pipe insulation that was 2" outer diameter and 1/2 inch inner diameter. These are the site I let my clones rest in. Their fan leaves hold em suspended wonderfully. I use Clonex Gel and a razor.. cut lower nodes, 45° cut under an old node, that had leaves cut off flush with stem, I scrape the lower 1 inch to allow for more surface area options for root possibilities, and then dip in the gel and set into the pipe insulation 1/2" hole. In the cloner, there is about 6 Gallons of PH'd 6.0 water (not sure which is best.. it's debated online) and I use GH Rapid Start Rooting Enhancer. I just go off the bottle for directions. I use two 14' long airstones to bubble the crap out of the solution, and a 30gal fish tank heater to maintain a good cloning temp. When the clone is ready, and there's plenty of root mass there, I will pull the insulation "puck" up and just take the clone right out of the slit that's built into the puck, and into my medium. I use Royal Gold COCO + Perlite + Sunshine Advanced Mix #4. They will go into 1gal pots, until done vegging, then smartpots to hold the coco etc and into Hydroton in netpots for flowering. (But that's getting a bit beyond this cloner)
I've only used this once so far, but I was never successful with cloning until now. This DIY coner will set you back about $40-$45 and will put a smile on your face when you start to see those big root masses building up on the end.