City water, (Beverly, Water quality report available online)They work. No issues. Are you on city or well water? How large is the tank? Depending on your source water you may want to consider the 5 stage. You could also upgrade the 4 stage to a 5 stage or 7 stage later if you wanted to.
I have the 5 stage 75 gpd premium plus that was eventually upgraded to 150gpd and then to a 7 stage 150gpd.
Yup i have mine upgraded to a 7 stage also.They work. No issues. Are you on city or well water? How large is the tank? Depending on your source water you may want to consider the 5 stage. You could also upgrade the 4 stage to a 5 stage or 7 stage later if you wanted to.
I have the 5 stage 75 gpd premium plus that was eventually upgraded to 150gpd and then to a 7 stage 150gpd.