The answer to this depends on how often you use your spa, how well you maintain it and what Chemical System you use.
As a rule you should change the water in a spas containing 700L to 4000L on average every 3-4 months for an average user and sooner for heavy users.
An average user would use their spa 2-3 times a week. A heavy user would use their spa 4-5 days per week.
Swim spas containing 5000L to 7000L will need to have the water changed on average every 8 - 12 months for an average user and every 6 - 7 months for heavy users.
Key tips for making your spa water last longer:
1. Always shower before entering
2. Keep your spa filters clean.
3. Keep your water balanced.
4. Use a good quality spa sanitiser and shock.
As a rule you should change the water in a spas containing 700L to 4000L on average every 3-4 months for an average user and sooner for heavy users.
An average user would use their spa 2-3 times a week. A heavy user would use their spa 4-5 days per week.
Swim spas containing 5000L to 7000L will need to have the water changed on average every 8 - 12 months for an average user and every 6 - 7 months for heavy users.
Key tips for making your spa water last longer:
1. Always shower before entering
2. Keep your spa filters clean.
3. Keep your water balanced.
4. Use a good quality spa sanitiser and shock.