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The first experiment using an alum solution ran continuously for four days. From the data, a 1 cm change in pressure was observed about 2.4 hours after the experiment began. Other fluctuations in pressure were observed throughout the remaining time, but they were deemed negligible. The blip seem in day four is a result of flow rate measurements made by the team.
Conclusions
For the first run, it appears that the orifice clogged after 2.4 hours. The clog was pushed through the orifice by a one cm increase in pressure. No other clogs were observed.