Drain very bottom of pool no working why?

- Clogged Drain: Check if the drain is obstructed by debris like leaves, dirt, or algae. Clean the drain cover and remove any visible blockages.

- Closed Drain Valve: Ensure the drain valve is fully open. The drain valve might be in a partially closed position, restricting the flow of water. Check the valve and make sure it is completely open.

- Damaged Pipe: Inspect the pipe connected to the drain for damage or leaks. Look for cracks, holes, or disconnected joints that could prevent proper drainage.

- Blocked Plumbing Line: There might be a blockage further along the plumbing line connected to the drain. This can be caused by tree roots, mineral deposits, or other foreign objects. You may need professional plumbing assistance to clear the line.

- Defective Drain Cover: The drain cover might be damaged or misaligned, causing improper drainage. Check the drain cover and replace it if necessary.

- Air Leak in the Plumbing: If there's an air leak in the plumbing system, it could disrupt the proper drainage of the pool. Check for leaks in the pipes and repair them as needed.

- Pump or Motor Issue: If the pool has a pump or motor responsible for circulating the water, a malfunction or power issue could affect the drainage process. Check if the pump is working correctly, and ensure there are no electrical problems.

- Design Issue: In rare cases, the pool's design might not facilitate proper drainage. Consult a pool professional to evaluate the pool's design and identify any potential issues.

If you're unable to determine the cause or fix the problem yourself, it's recommended to contact a qualified pool service technician to diagnose and resolve the issue.