[Hawkwind]

Tom

Local plumber gave me this tip when I had a blockage problem one day AFTER my return from a months stay a number of years ago. It seems some "stuff" blocked the drain to my septic system and with no water flowing dried and partly blocked the drain. I would think the same could occure on a city system.

The local plumber recommended that I fill the cloths washer with water and stop the cycle at that point. Then turn off the water supply to the house and close the valve at the holding tank if you have one. Restart the washer to a spin cycle to pump all the water out of the washer and through the system. This will clean anything in the main drain pipes to the street or septic system if you have one. While the washer is running you can quickly drain the other water lines within the house.

Also you may want to get some RV anti-freeze to put in the drains and toilets. You can get the RV anti-freeze at Home Depot and a cup or so in each drain that has a trap should do the trick.