with these kinds of systems you have to clean your res more often to prevent builds up from happening. you have to mix your nutes twice a week minimum to keep it clean. and do yourself a favor and stay away from organic nutrients anytime your using drippers or systems that can easily clog. Also clean all the fittings you need to clean to prevent clogs. Run straight 5.5 to 6.0 ph'd water every time you change your rez.