Low water pressure immediately following DIY or professional plumbing repairs is typically caused by debris, solder flux, pipe dope, or Teflon tape clogging the lines, or a partially closed supply valve. When pipes are cut, soldered, or reconfigured, loose metal burrs, pipe scale, and excess sealing materials can break free and travel downstream, lodging inside the nearest faucet aerator, cartridge, or valve seat. Furthermore, if you forgot to open the main supply shut-off valve or an individual branch valve completely after finishing the repair work, water flow will remain heavily restricted. Verification: Inspect faucet aerators for trapped debris, and verify that all shut-off valves are fully open.
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