I have an AquaticLife RO/DI with all filters and membrane changed on 7/1/20. I’ve collected maybe 20 gallons. I’m getting varied TDS readings and don’t know which to believe. I get zero TDS on the in-line probe, 6-11 with two different handheld meters if I collect water in a specimen cup and then off the charts if I collect in my brute container. I’ve heard of phosphates being elevated if water is left in a brute for too long but I’ve never heard of high tds. So which do I believe? (Keep in mind that all these filters are brand new.)