i have open 1/4" lines going to most of my coco pots..some have T's on the ends to restrict flow a bit...when i do sea green or teas, i have a 5 gal bucket with food and SG/tea in in..pump that through my lines then put my pump back in my clean res and pump another 5-7 gal through the system to, hopefully, rid the lines of any organic matter...i also use drip clean (well DIY dripclean using PeKacid) at 1ml/gal...
but curious what other folks are doing and having success with out there as well...