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I see many threads with similar symptoms, but not quite what I experienced: BLUF: Before replacing flow meter (2-wire version), I had 3700 ppm salt. After replacement with aftermarket 4-wire sensor (only used the two flow wires, isolated temp wires), flow is working but the salt reading dropped...

I bought my house 7 years ago, and it came with my first pool/spa. As an experienced Aerospace Engineer, it has been great fun learning how this stuff works. I am learning that the original builder/installer may not have known their business very well. My spa overflows into the pool. My return...