How much swimming pool salt do I need?
In swimming pools that use salt electrolysis, topping up the salt is an essential maintenance step. While salt itself does not evaporate and can, in principle, remain in the pool indefinitely, it can be lost over time. Common causes of salt loss include:
- Backwashing of the filtration system
- Heavy rain or water splashes
- Salt sticking to swimwear or pool surfaces
Adding too little salt can reduce the effectiveness of your electrolysis system, allowing bacteria and algae to grow. Conversely, too much salt can damage your equipment.
Table of Contents
Determining How Much Salt to Add
Before adding salt, consider three key factors:
- Pool volume – the total amount of water in your pool
- Current salt level – how much salt is already in the water
- Desired salt level – the target concentration for optimal operation
With these details, tools like Moses’s salt calculator can quickly determine the exact amount of salt you need.
Calculating Your Pool’s Volume
If you don’t know the pool volume, you can usually find it on your installation invoice or ask your pool installer. For rectangular pools, use this simple formula:
