Can I use SENSE C2 / C2+ cassettes in the SENSE S1?

On 7/7/25 WaterGuru pushed a firmware update to all SENSE S1 devices that enables them to use SENSE C2 cassettes.  

On 5/11/26 WaterGuru launched new C2+ cassettes. The new C2+ cassettes are also compatible with the SENSE S1.

Note:  Before switching from S1 cassettes to the C2 or C2+ cassettes, you must use up any S1 cassettes.  After you insert the first C2 / C2+cassette and it performs it's first measurement, your S1 device will only be able to work with C2 / C2+ cassettes.  

See here for more information:  WaterGuru SENSE Cassette 3 Pack for Pool Monitoring