All, We are FT living in ours while home is built. The #2 gray tank, 26 gallons, fills up very quickly yet "supposedly" it only collects water from the garage shower, sink and kitchen sink (which we use sparingly). I take showers everyday but assume that fills up the bigger #1 tank located directly under the shower. There's no possible way the #2 tank could fill up from the garage fixtures plus kitchen sink that fast. ANy ideas? Does the #1 tank overflow to the #2 tank? Thanks