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The color change happens to all new units. That is the Fe (iron) leaching out of the plate material. 304 stainless steel is the most common stainless available and is what I use. 316 and even better 316L is the preferred material for plates and tubes. They all contain iron but to lesser amounts. The leaching is handled in the "conditioning process" of the ss material before the actual use of the unit. You can just pour out the water and start again (and again and again) or you can reuse the water by pouring it through a coffee filter.
As to the definitions of cell and stack. A cell is the area between the plates or tubes. A stack is a collection of cells. Parallel cells are simply (P=plus or positive, M=minus or negative, N= neutral or no connection) P M P M P M (which is 5 cells, could be any number you choose). Series cells are normally used with neutral plates as:
P nnnnnn M (which is 7 cells, again could be any number). What I use is a combination of parellel and series as: PnnnnnnMnnnnnnPnnnnnnMnnnnnnPnnnnnnMnnnnnnP etc. Each neutral becomes bipolar in that on the surface of each neutral facing P, the plate is M, on the surface of each neutral facing M, the plate is P. Hydrogen comes off the M, oxygen comes off the P.
There will be more production in my setup as oppossed to parallel and even more production in a pulsed system or a rf system. But that is for later, not now.
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