In 2 1/2 years, I've cleaned my tubing out maybe twice. It gets crusted up in the bottom half, I just squish it a little and start a drip. Somebody mentioned an IV drip bag, not what I'm doing. I can drip about 2 1/2g of kalk a night, limited by size of Sterilite container. In reality I don't drip it very slow. This is small tubing and I set it at a very fast drip or almost steady stream. It takes about 2 hours for all of the kalk to run out of the sterilite container. This way I don't get the clogs, and has worked well for a long time now. I drip right into my sump where the two 1" returns come from the main tank. by the way, this is a 180g tank, not something small like a 29g, etc.