Hi Brian from iSpring Tech Support. I had some issues with missing parts and Brian Deliver did a wow job. I installed a fairly sophisticated version of this system in my basement and added many additional components to make it work properly. My system was missing a parts kit and was also missing the retaining ring on the 5th stage filter inlet fitting. Brian went further and not only sent me the bag of missing parts but ended up sending me lots of extra parts for future breakdowns and even added a custom check valve due to the long return and vent line to the drain port. Eventually he sent me a new 5th stage filter with the correct connectors which were not included in the original unit. I have to give iSpring kudos and kudos for the excellent support. If someone buys a system like this and doesn't understand the basic plumbing, you'll feel safe as they can help you with parts and install anything over the phone other than handing you a screwdriver.
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