The āPā trap (named after its shape, has nothing to do with urine) is there to prevent sewer gases from entering your home. It stays filled with water to form a barier. Sewer gases are not good for you. In the right concentration they can even be explosive.
Apron sinks, also known as farmhouse sinks, are kitchen sinks often found in rural homes in decades past. The apron sink is distinguished from the kitchen sinks of today in the general design of the sink, as well as the choice of materials to create the sink. Because this sink has a distinctly country feel, it works well in kitchens decorated to resemble the look of the latter 19th and early 20th century farmhouse kitchen.
One of the features that makes the apron sink a little different from other sink models is the depth of the basin or bowl. This was a practical feature, in that the kitchen sink needed to be deep enough to accommodate the large pots used to prepare meals for large farm families. The depth also made this kind of sink a great help when there was a need to soak several pots and pans in order to remove food residue.
Unlike the recessed sinks of today, the apron sink sports a front that rides above the surrounding counter and juts out slightly from the supporting cabinetry. Again, this was a practical design that helped prevent damage to the cabinets, as any water or suds that dripped over the lip of the farmhouse sink would drip to the floor rather than puddle on the wood of the cabinet countertop.