A question for you Helmer UltraCW cell washer users. In the preventive matintenance schedule it indicates that a rather extensive system flushing should be performed on a weekly basis. How many of you are actually flushing the system as described on a wekly basis and if not why not. I am having a battle with a corporate medical director over this. My contention is that, first off this is a recommendation based on heavy use of the machine and since we will not be using it heavily the flushing procedure is a lot of work for no benefit and quarterly or even semi-annual would be quite enough based on our use of cell washers. Her contention is that if the manufacturer recommends it we must follow it; end of discussion. To counter this my stand is that this is a machine, not an instrument or reagent that was processed through the FDA's 510K process. Anything the manufacturer suggests/recommends is simply that, a suggestion/recomendation. This came up because we use corporate wide, standardized SOPs and we are in the process of writing an SOP for the use and care of these machines.