Air in a pool filter is typically caused by air being sucked into the system before it reaches the pump, or, less commonly, from outgassing of the water itself. Here's a breakdown of common causes:
Common Causes of Air Leaks
- Low Water Level in the Pool: If the water level is too low, the skimmer may suck in air along with water. This is a very common cause.
- Loose Skimmer Basket Lid: If the lid on the skimmer basket isn't screwed on tightly or doesn't seal properly, air can be drawn in.
- Faulty O-rings: O-rings on the skimmer basket lid, pump lid, or other connections can become cracked, worn, or improperly lubricated, leading to air leaks. An O-ring that is not a perfect fit will also cause this.
- Loose Fittings and Connections: Fittings and connections on the suction side of the pump (the pipes leading to the pump) that aren't properly tightened or sealed can draw in air.
- Damaged or Cracked Pipes: Cracks in the pipes leading to the pump can allow air to enter the system.
- Problematic Valves: Pool valves may not be sealed properly, leading to air being sucked in.
- Pump Issues: The pump itself might not be sealed properly, particularly around the pump lid.
- Clogged Skimmer or Pump Basket: A clogged basket can restrict water flow, creating a vacuum that draws in air.
Other Potential Causes
- Outgassing: Although less frequent, particularly in cooler water, water can release dissolved gases (like oxygen and nitrogen), especially when the water is heated significantly. This can sometimes contribute to small amounts of air accumulating in the filter.
Solutions
To address air in your pool filter, systematically check each of the above potential causes. Start with the most common and easiest to fix: checking water level and ensuring skimmer and pump basket lids are secure and O-rings are properly lubricated and in good condition.
