Observed unusual 6" gap between shower stall floor and drain water level during abnormally dry period last month and subsequently made daily measurements for the last 16 days. The level is now back to normal (stagnant drain water about 2 inches below shower stall floor). The daily fluctuations trended to correlate inversely with air pressure. Measured electroconductivity of many household fluids and beverages more than 50 times last week and found tap water electroconductivity to be higher than distilled water and lower than most beverages and more stable than the prepared carbon dioxide drinks. We did not experience power outages last week.