Amazon has an 031 with one filter tower, has auto purge and has a rocker switch you have to press to purge it. So how is it auto purge? the 032 unit has the same switch but it isn't marked. But it has the purge unit itself? So for now I'm really confused. I passed on the 031 due to the single filter tower. It also has a larger air intake? So out of the price range on these units I don't know which is the best one to buy. Someone is up to some monkey business from what I see!
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