I looked into the systems quite a bit. I was looking to get one that is fairly easy to install since I am going to be doing it myself. I also wanted to get a really high quality set up with easy to change out filters.    Edit:  Here is the top option I am looking at now: https://www.amazon.com/Home-Master-TMULTRA-ERP-Undersink-Reverse/dp/B00N2941Z6/ref=sr_1_4?dchild=1&keywords=home+master+tmultra&qid=1605647971&s=hi&sr=1-4  No added minerals. It does not help prevent the tank from degrading, but I am assuming just those extra minerals help do that. I guess the concern would be on how long the actual tank lasts, but this seems to be one of the better systems I have looked at on the market.     I am curious on your guys thoughts of the added minerals?  Home Master TMHP HydroPerfection Undersink Reverse Osmosis Water Filter System https://www.amazon.com/gp/product/B00N2941N8/ref=ox_sc_act_title_1?smid=ATVPDKIKX0DER&psc=1 The filter has calcium bicarbonate 95% & magnesium 5%. The blend of calcium and magnesium at a rate of 30-60mg/L. I believe the calcium bicarbonate would be coming from lime stone and the magnesium from marble.  I did a lot of research on the berkey system I have and it has been a total waste. The system is a total pain in the ass to use and it failed before 10 months. I am looking to upgrade and get something that is the best option, but there is a lot of confusing factors on these filters. I obviously don't want to order a system that is going to have garabge in it I don't want, but it would probably be better than the berkey regardless.  Any thoughts or experience with units you have had?