From what I read:
While this washer was the first of its type, it had a design fault where little protrusions were present to prevent prints from sticking to the walls. Stagnant water around these spots prevented the prints from evenly washed, so later on, marks corresponding to these spots started to appear on prints washed in this washer, and it led to the demise of East Street. I guess you can still use it but if I were you I would be tempted to move the prints around in the chambers rather than just leaving them inside during the wash.