Leaf there's a couple ways to do it....X-Crispi sets his up by "daisy-chaining them" instead of one entry/exit hole they come with. This is not hard to do with a good drill and some grommets.....you can get 1/2 grommets at the hardware or hydro store. I set mine up to drain from one set of lines and fill from another using the pump you see there.

You seem like a sharp cookie so let me dig up an old thread for you to look at.....I think you'll like it.
Weedhound Reviewed by Weedhound on . First Time DWC W/ Water Farm Buckets This is my first Bucket grow ever. I have done tables before and had great results Soil ect... Then I seen the excellent results People were getting out of 4 bubbler plants with LST. So I Just purchased 2 8 pack Water Farm Bucket Systems. After 5 days I can see that I need to buy a stronger pump and more line cause I cut it all down. I'm running tap water 7.8 dropping it down to 5.8 to 6.3 W/ PH Down. I set up the system without washing the Hydrotone and balancing the PH level of it. I did Rating: 5