The Aquia II uses a washdown flush, but there is some refill. There is a refill tube that runs from the fill valve to the flush mechanism. Presumably, you could interconnect the automatic bowl cleaner thingy between the fill valve and flush mechanism. However, I really don't know how "safe" this is, because I'm not clear what the water path is from the input to the flush mechanism through it, and down to the bowl. The reason the auto-clean works on a traditional flush valve is that the overflow riser (into which you dump the chemical water) bypasses the flapper completely, so that you typically don't get the bowl cleaner on the rubber when it goes down the overflow riser. Because the Aquia uses this mechanism-thing, I don't know whether the refill water (and thus the chemicals) go through it and bypass all the rubber, or whether they come into contact with rubber at any point. If they do contact the rubber or any internal gaskets in the mechansim, the chemicals won't be good for it. You might be able to examine the mechanism and it might be obvious from looking at it how the refill water flows, but it might not be. You might try calling Toto customer service and asking them this question. They are often pretty helpful. Let us know what they say. They are toll-free at 888-295-8134. Friendly folks in Georgia, USA.