Pool and Spa
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Here is a copy of the owners manual look at page 52 and go from there but this will be your resource for all things related to your spa.
I would need a year for your spa. You can look under the spa cabinet by where the pumps are and there should be a label that will give you the serial number and date of manufacture. Let me know what year and I will research that.
Here is a link to the 2006 Legend series manual