Can I use a pool pump for a saltwater pool and a freshwater pool interchangeably?

Yes, you can use a pool pump for both saltwater and freshwater pools.

Pool pumps are designed to circulate water and play no direct role in water sanitation. Therefore, at the core, a pump suitable for a freshwater pool can also be used for a saltwater pool. However, there are considerations to bear in mind:

1. Corrosion Resistance: Saltwater is corrosive. If you're using a pump originally designed for freshwater in a saltwater pool, ensure that all its components, especially the seals and metal parts, are resistant to saltwater corrosion. Over time, salt can degrade materials that aren't designed to withstand it.

2. Thorough Cleaning: If you're switching a pump between saltwater and freshwater applications, it's essential to clean it thoroughly to prevent cross-contamination. This is especially vital if the freshwater pool doesn't have a saltwater chlorinator.

3. Matching Other Equipment: While the pump might be interchangeable, other equipment such as salt chlorine generators or specific filters tailored for saltwater might not be suitable for freshwater pools. Always ensure that the entire system is compatible with the type of water being used.

4. Manufacturer Recommendations: Always check the manufacturer's guidelines. Some pumps might be explicitly designed for one type of pool over the other, and using them interchangeably could void the warranty.

In summary, while it's technically possible to use a pool pump for both saltwater and freshwater pools, you must ensure it's suitable and resistant to the challenges each water type presents. If in doubt, consulting with a pool professional or the pump's manufacturer is advised.