Has anyone got a purefreedom RO that understands how it works? Other RO's seem different when flushed compared to this. Tap is at 235-240ppm. The ppm is creeping up on production, is now at 24-25ppm before DI. Month ago it was bout 18-20ppm. The pre filters only been in couple of months and membranes bout 10 months flush 3-4 times per week. Water pressure good but don't have a gauge. I no that the RO works harder with the colder water and pressure can drop at this time of year and production can slow which I don't think it has but if you understand the purefreedom RO on flush the production is about 12-13ppm, flush off it increases to 24-25ppm which is normal production. Is the ppm increasing because the water is so cold at this time of year or could there be another issue?