I noticed my carpet in my living room was getting wet after taking a shower. I unscrewed the metal drain and noticed two rust holes in the tubwhere the drain mesh met the tub. I dont really want to replace the tub, what other options do i have?? Any response would be greatly appreciated.

Our 3 yr old two story with full basement is on a septic system. My puzzling problem is an apparntly random occurence of sewer gas in the upstairs. I videotaped the construction and have determined that the upstairs showers do not have traps. However the waste line serving this portion of the house has a trap in basement. The one and only vent serving this portion appears to have little horizontal slope to it as it connects to the main vent stack in the attic. Is it possible for gases to get sucked back into this portion of the vent system and travel downwards exiting into the shower drains? Or, is it common for the trap in the basement to get sucked dry? Which is more likely? How to fix? Very motivated. Den