The best material for a sump pump hose is typically a flexible, durable, and weather-resistant material such as reinforced PVC (polyvinyl chloride). Reinforced PVC hoses are popular due to their combination of flexibility and strength, which allows them to withstand the pressure of water being pumped through them without kinking or collapsing. They are also resistant to abrasion, chemicals, and UV rays, making them suitable for both indoor and outdoor use.
Another good option is a rubber hose, which offers excellent durability and flexibility. Rubber hoses are highly resistant to wear and tear, temperature variations, and chemical exposure, making them ideal for heavy-duty applications. However, they can be heavier and more expensive than PVC hoses.
Polyethylene hoses are also used for sump pumps, especially in temporary or light-duty applications. They are lightweight and cost-effective but may not be as durable or flexible as PVC or rubber hoses.
When selecting a sump pump hose, consider the following factors: 
1. **Diameter**: Ensure the hose diameter matches the pump's outlet size for optimal performance.
2. **Length**: Choose a length that allows the hose to reach the desired discharge point without excessive slack.
3. **Reinforcement**: Look for hoses with internal reinforcement to prevent kinking and collapsing.
4. **Temperature and Chemical Resistance**: Ensure the material can withstand the environmental conditions and any chemicals present in the water.
Ultimately, the best material depends on the specific requirements of your sump pump system, including the environment, frequency of use, and budget.