Fellow netters:
    My lab uses zinc formalin as the primary fixative. Sakura recommends a 
water rinse to routinely flush out potential salts from depositing on the 
O-rings and rotary valves. A recommendation was made to use glacial acetic 
acid in approx dilution of 200ml per gallon as a wash for removing the zinc 
from the mechanism.
    My question is what might the recommendation as to frequency of using the 
GAA.
    Any help would be greatly appreciated.

 Jerry Meade
 University Laboratories
 Detroit Medical Center
 Hutzel Hospital