So I have an awesome spectra 200 watermaker
that is older than creation, and has given me amazing service
over the years. Since changing the membrane out about a year ago it will give ppm readings of just over 300 after I change prefilters, and each day after I have changed out the pre filters the ppm goes lower (like down 20ppm per day) and lower until I swap out the pre filters again and it will go back up into the low 300ppm’s again. Any thoughts?