APEX itself has not documented the 4th and 5th stage installation, no need for 3-5 years. The new filter membrane is smaller and the required T-piece was not included. The colors of the tubes and the setting are different from the manual ones. I'm practical, if not handsome, and I've still wasted a lot of water. I felt completely incompetent. but I got through it. The system is good. They need new technical writers.
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