same deal here i have a dwc setup and im having to add down 1 to 2 times a day i just washed them in tap water so i seen this up there>>>>

Went back to the shop today and discussed the problem i seem to be having and with mine being dwc, my problem is/was different(flushed again today and have been stable for 6hours). As far as your setup other than the drip ring being "dirty" she said she would ditch the hydroton and start fresh. She also keeps promoting coco fiber as a better medium. Ive got four clones started and im going to give it a shot. Good luck and let us know your findings.. what did u do to fix ur's for dwc thats what i have??? im using well water