11 notches, 2" apart, on center. As near as I can figure, (i.e., a rational explanation) the notches assist in breaking up surface tension and head pressure from water traversing the tops of the low dividers, preventing them from bowing (much) in the direction of water flow. They may not be entirely necessary, given a low pressure inflow, but you could test this for yourself. I would be interested in hearing about the experience of cutting plexi properly yourself, or their additional manufactured cost. The gravity fed Eco-Wash is a first rate washer, employing an automated, vertically oriented, and proven "fill-and-dump" method. You can calculate proper flow rates in the washer by dividing the entire volume of the washer by the number of functioning slots, then adjusting the inflow and out flow, to calculate the appropriate water exchange rate (how long each print is allowed to diffuse hypo) in each compartment for adequate cleaning, and then go to lunch.
The washer in back of the Cachet in the posted pic is a Calumet 20x24 cross-jet (the flat style side washer is a 16x20 holding/pre-wash). It is somewhat wasteful of water, isn't proven to clean prints any better that fill and dump designs and needs a constant flow water to operate as intended (i.e., Nobody flush a toilet while I'm washing large prints!). I only use it for 20x24 and large format sheet film. Because of its proven method and simplicity of use, the Eco-Wash is my archival washer of choice for everything 16x20 or smaller.
BTW, it was fortunate I logged in and saw your post in the recents list, otherwise I would not likely have seen it. I only participate where I can make specific contributions (as opposed to unsubstantiated opinion).
Making nice looking prints is kinda my thang.
Last edited by ROL; 01-04-2013 at 04:34 PM. Click to view previous post history.