As with everything, it depends on some variables. How often do you use it? We have had no problems with the dosing pump itself in 6 years. The diaphragm has been replaced a couple times. I have replaced most of the butterfly valve seats now. I have replaced the main large flat doughnut ring seals on either end of the main manifold twice, as well as the hard Teflon seats for the vertical screens twice. I pull the screens out quarterly for inspection and replace the double o-rings on the bottoms every time. We run a light BruREz cleaning before every use, then let it soak in diluted Birkodyne overnight. Quick pasteurize and it is ready to rock.
CBO "Chief Brewing Officer" / Zymurgist
Bluegrass Brewing Co
636 East Main St