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In a chlorine system you cannot create FC from chloramines. Chloramines are oxidized and either gas off or are converted to salt, which cannot be regenerated into chlorine unless you have a SWCG. (In a bromine system sodium bromide CAN be converted back to bromine sanitizer by an oxidizer such as chlorine, MPS, or ozone.) If the spa is indoors then the buildup of volatile oxidation byproducts in the air might present a problem much the same as with an indoor pool but in an outside spa just take off the cover and run it for about 15 min before going in to allow them to gas off. Have to agree with @RDspaguy.

Instead of a chemical cleaning, I started using my 3D printing & design experience to try improve how I physically clean the filters. Took me a year of prototypes trying different things but I've finally designed something awesome and universal to turbocharge my filter cleaning. Two years of testing and I'm really happy with my design. I can't wait to share it with the community after I finish all the paperwork and such.

How?