Those of you who use simple tubing drippers to dose, how long do you go before cleaning and or replacing the dripper lines? I am curious about 2 part, trace, and kalk. I know kalk will probably clog up first, is that after 2 weeks? A month? The others (2 part, trace)? 
How do you clean them and how long before you discard and use a new one tubing?
How do you clean them and how long before you discard and use a new one tubing?
