BND, I find nothing about a Jr. model on the site and have no mention of it in my 2005 Tech manual. It sounds like it's the AquaTrol for AG pools.
MY understanding, from reading the posts here, is that the larger the cell, the less often it will have to be replaced. Cell life is determined by the amount of time it's 'active', so a cell that is 1/2 as large will produce the same amount of chlorine @ 100% as a cell that is 2X as large @ 50%. If you're getting a great deal on the smaller unit, be aware that the cell will need to be replaced more often and take that $ into account.
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