Your all-in-one solution for keeping your cold plunge clean and crystal-clear. Kit Includes: Filter Pack 16 oz Sirona Sanitizer 32 oz Sirona Oxidizer 16 oz Sirona pH Up 16 oz Sirona pH Down 25 Testing Strips Water Maintenance Protocol These sanitization products are free of chlorine and bromine Maintenance: For Residential models: For optimal performance, it's recommended that you replace the filter every 3-4 weeks depending on usage. For Commercial models: For optimal performance, it's recommended that you replace the filter every 3-4 months depending on usage. Compatibility : Our cold plunge systems are exclusively optimized for use with our filters. Using any other brand or model may result in system malfunction. If you have any uncertainties regarding your filter's compatibility, please reach out to us at [email protected] for assistance.