Hi. I just installed a stand-up shower in a new bathroom. However, when I tested the shower, the water pressure was only a trickle. So, I adjusted the screws on the pipe to increase the water pressure, and I was happy to see the water flow. I left the reno that evening, and my friends all took showers without problem (2 showers). Then, the next day, the shower was no longer working (same trickle problem). Any ideas