@Grow_for_Happiness, Hi Thanks for your inquiry. I use what the system came with in Line Dia. Dia Should make no difference other than blockages. I have only flushed the lines once and they weren't that dirty, I guess it's dependent upon your nutrition blend your using. I do clean the reservoir and the little filter inside every week so I let the reservoir go close to dry then disconnect and clean. I periodically lift the pots side quickly for weight and check the float area for liquid. If Dry and the reservoir is full. Houston you have a problem.๐ Happy Growing!!!
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