That's what I thought. Thanks for the link.

My change in salt level must be due to the dilution from rain - if in fact I am lossing salt. I still have not confirmed that the (low salt) SWG readout is correct. I also posted a question regarding the PS234S salt test because that test says I have an plenty of salt in the pool. Your reply further confirms my suspicion that the SWG is not reading the salt levels correctly.

Thanks.