Visually inspect the piston seal cavity in the pump head. Use magnification if necessary. Remove any foreign material using a cotton swab, or equivalent, and avoid scratching the sealing surfaces. Be sure no fibers from the cleaning swab remain in the components.
The pump head, may be further cleaned as follows:
Remove inlet and outlet check valves.
Clean with 50 % isopropanol in water in an ultrasonic bath for at least 30 min, followed by rinsing for at least 10 min in 100 % isopropanol. Be sure that all particles loosened by the above procedures have been removed from the components before re-assembly.
Replace the check valves.
Wipe off any residual liquid from external (non-sealing) surfaces with a soft cloth such as a microfiber towel.
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