A water filter leaking from the top usually means the housing-to-head seal isn’t closing properly. The most common cause is a mis-seated or worn O-ring that can’t hold pressure, but cross-threading, over-tightening, a hairline crack, or trapped air can also force water past the cap. In our Boynton Beach service area, mineral scale from coastal water can stiffen O-rings and make small leaks show up after a cartridge change. A quick technician check is to pressurize slowly and watch for weeping at the cap seam rather than a full spray.
If you see drips at the top, check these specifics:
- Clean, lubricate, or replace the O-ring; use food-grade silicone grease.
- Reseat the cartridge; confirm correct size and full engagement.
- Inspect threads for cross-threading or a warped cap; snug, don’t overtighten.
- Look for cracks and verify inlet pressure isn’t spiking.
Always shut off the water and relieve pressure before opening the filter housing.
Updated: 2026-08-22
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