No backflushing. My TDS input is over 300. The blocks last about 6-12 months for me. My pressure drops from 90# to about 75# but doesn't seem to impact production much. Yes one draw back is proprietary cartridges.I have one of those units. It’s fairly new but my pressure is dropping quickly (input water: tds=85ppm). Did you backflush it? If so, how did you do that, and have you found other pre-filters other than the ones on their website? I bought some generic 2.5” filters that had different sizes interior holes. Thanks
Haven't had to replace RO membrane yet. I'll decide then to continue with it, or use unit that can use standard cartridges. The cartridge and membrane are about the same price as others and it works well so really doubt I change anything.