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Laura4892
Small foamers (BOYU) are with the Weaver's rail. Now about the design of the filtration chamber. The chambers - F2 and the pump - the level will not be constant there (constant only in the first and second). Evaporation (+ the foamer will push out some water from chambers 3 and 4). Are you planning an auto top-off? The pump - with one, fewer questions about the joints. With two - you can direct the flows independently. The openings, in my understanding of this design, should be at the same level.