That means it was never properly cleared properly
Every six months and water Jetted once every 2 years
Partially clogged main drain or the little holes you see under the rim may be stopped up. Another possibility which is rare but can happen is the vent pipe can become plugged.
It is good for a homeowner should intensely focus on drain cleaning of their home about once every three months. This will prevent further damage from clogs.
If you go to the Dentist every 6 months it can be controlled get a deep cleaning that always helps every 2 years
No month has a guaranteed Friday the 13th. Every year does though.
Just replace it every 36,000 miles and you will know it is not clogged.
putting a vent on the outside of every drain would block out most debris from going down the drainwithout a vent, the drain could get clogged by misc. thingsin my opinion, drain should have vents, escpecially if you have kidswith the vents, kids won't be able to play and "accidently" shove the plastic t. rex down what they call "the bottomless pit"Waste and soil lines do need a vent .. Storm lines because they do not contain sewer gases do not need a vent Check local codes
To keep your sink clean and clog-free, a cheap alternative to expensive products is to pour boiling water down your sink every few days. If your sink is clogged, try a solution of baking soda, and a few tablespoons of vinegar before rushing out to buy expensive drain cleaners.
At the least every 6 months. It also depends on how much water your using. Its always best to check them every two months to make sure they are still good.
There should be a new one in May 2012. Usually every 6 months. No, there is always one at thanksgiving (in November), 1 every 12 months :)
Every block has one (L4 or L6) or two (V6 or V8) coolant drains. Not always easy to access.
Once every 12 months, once every 6 months, once every 3 months