My 5-stage reverse osmosis system is 16 years old. I just disinfected it and changed all the filters and membranes. The last water came out at 33ppm. It turns out that the check valve is defective. After installing a new YZM check valve, the drinking water level drops to 24 ppm. In addition, the non-return valves adapt perfectly to the membrane body with a little Teflon tape. Highly recommended.
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