**2022 UPDATE**The head unit started leaking outside through one of the screws on top. Definitely a crack of some sort. I called support to ask if there was anything I can do to fix it and Nick said they would replace the unit entirely.I was floored at the level of customer service. You literally do not get this kind of care/support anywhere.Thanks goes to Nick and the iSpring team!First off, shout out to Don who works at ispring for helping me out.TL;DR - Great Unit, Don at iSpring was extremely excellent, if I had a chance to do-over, i might have gone for the bigger unit (most likely will if I ever replace this one)I bought this unit in 2019, but didn't install it until I moved into my current house. Boy oh boy was it a nightmare getting in. I'm a DIYer and love a good challenge. I'll spare my details, but basically I had to change where I mounted it because of the location of the water line coming in and the space around it.Note* I did not install a bypass, but rather an inline-leg. So to change the filters I have to shut the water off at the house. I'm fine with that, but others may not be.Once installed tho, the water chambers filled nicely. Water started flowing. About 2 mins later, the unit started leaking at the in/out female connector. That was my fault, not enough Teflon. But the male/male connectors in between also started dripping.I called support and spoke with Don who was very informative and helpful. He suggested different Teflon (Blue Monster - excellent stuff more on that later). He was also shocked about the leak in between the filters so he said he would send a replacement head unit.Unit arrived and unfortunately it was a new model type where the filters were closer together so I had to cut my pipe up a bit to make it fit.Teflon Blue Monster, YMMV, but I put 6 wraps on it and put the male connector in, then backed it out to put 4 more wraps on it. The 6 wraps formed this nice plastic sheath/coating on the male connector so I knew it would make an excellent seal this time (the original Teflon I used was like 4 wraps of cheap lowes stuff, and it disintegrated as it came out).New unit in place, turn the water back on. No leaks on the in/out connection. However, the male/male connector in between the filter did start to have water form up. I took pictures and sent them over to Don.I opted for compensation of 1 set of new filters as I would rather not have to install another head unit.IF/When the leak progresses , I'll see if I can wrap the connector units with blue monster as well.Water taste is great, I love that it's 0 waste and the whole house has nice clean water. It's so comforting to know that even my toilets are filled with purified filtered gold.Hopefully this is helpful. If you take nothing else away, know that my case is unique. I don't think it happens often. But iSpring WILL take very good care of you.