Water pressure that starts out strong when you first open a tap but drops sharply after a few seconds is typically caused by a partially clogged whole-house sediment filter, a failing well pressure tank waterlogging, or a restriction in the supply line. As water flows, the initial pressurized volume in the line evacuates faster than the restricted supply pipe can replenish it, causing an immediate drop in flow volume and velocity. Verification: Check the pressure gauge on your well tank or inspect the whole-house sediment filter cartridge for heavy debris.
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