If this looks familiar, it may be time to redesign your oil room. This drum has a loosely inserted drum pump allowing destructive abrasives and other contaminants to enter the oil freely.
Perhaps a better solution would be a gravity-fed lube station which provides proper venting to reduce moisture and particle ingression. Depending on fluid viscosity and head, spin-on filters should be mounted on the discharge lines leading to nozzles; one per tote (or drum).
Considering that dispensing is accomplished by gravity, it may be necessary to use large-can spin-on filters for higher viscosity fluids. The spin-on filter heads can be mounted directly onto the rack. Sharing a desiccant breather between the containers keeps incoming air free from particles and moisture.
