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I have only worked on one swg in a spa. It was an aftermarket inline install, and may have been meant for a pool. I have never seen such corroded, ate up equipment in my 26 years in this business. Even the circuit board in it's box looked like a shipwreck relic. As a result, I do not recommend...

In my experience that is not the case.

I see many flow switch failures wherein the stem cracks and leaks water into the circuitry resulting in a closed switch failure. Likewise, I have seen them get hair wrapped around the stem and flap with the same results. Granted most were on portable spas, but the same design.

All good points. And dual failures are rare, but they do happen. Especially if there is something causing them, like bad chemistry (which shouldn't be a problem if you use this site). That said, I too am a fan of safety devices. And the cost of failure can be pretty high in this case, even if...

Something like this? https://www.1paramount.com/product/plug-in-120v-flow-switch-for-2-pipe/

That is part of your filter. If you remove the top you will see a small hose coming up the center, it goes there. That one is damaged, you will need a new one.