This remarkable behavior has limits that manifest as either flow or complete clogging. The boundaries of intermittent clogging depends on the concentrations of components and on flow rate. Fig. shows the conditions at which flow (shaded blue), intermittent clogging (shaded yellow), and full channel clogging (shaded red) occur. The data shown in Fig. indicate results obtained at Q T = 1.2µL/min, representing the flow rate at which the largest number of flow tests are performed. The 31 data points in Fig. each represent at least one flow test, and include the conditions in Table where Q T = 1.2µL/min. High concentrations of alginate and calcium lead to complete clogging of the channel. We consider the channel completely clogged when the pump reaches its maximum driving pressure of 2000mbar and flow subsequently stops due to the obstruction of deposited gel. Most frequently, a complete clog manifests as the driving pressures of both calcium and alginate channels reach the maximum driving pressure (SI Fig. ). This behavior occurs in the large majority of all flow tests that fail at high concentrations, regardless of flow rate. In the remaining few instances however, the clog occurs in the alginate channel immediately upstream of the junction such that the calcium channel remains unobstructed and the calcium solution flow continues.