I have both a salt meter and the chemical test. I actually use the salt reading on the SWG now. Neither the meter nor the chemical test are particularly accurate and the important thing is to make the SWG happy and efficient. If the SWG tells me it is happy and it is generating a consistent amount of Cl, that's good enough for me. The only time I use the tests is when the SWG tells me it is unhappy. If the test says the salt level is reasonable, I replace the salt/temp sensor on the SWG and all is good again. The salt can't be depleted other than through water leaks, splash out, or rain displacement; it's not like pH or Cl.