<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by ISLAPP:
If I may expand on some items already mentioned and add a couple more here. First, you mention you have had this problem since you bought the rig. I presume you bought it used.
Things to check: Has the roof vent fallen down inside the black tank to where it isnt venting.
Get up on the roof, take off the vent cap and make sure the vent stack is up above the roof line about 1 7/8" to 2" above roof line. Is the stack loose to where you can raise up out of the roof? Pull lightly on stack to see if it moves. Is there a gap between top of stack and vent cap for the air to come out?
There is a product that dealerships will use to really break up the crud in older tanks when people havent properly used them. You may have a severe build up of junk in that tank. As mentioned, use plenty of water and drain and flush several times. Put a clear elbow on your sewer hose so you can see what is coming out. Always drain before leaving the campground. Refill with fresh water at least 5 gallons or more(rule of thumb is 1/3 full on tank), but normally alittle less is ok. Try putting ice cubes down it while traveling to break up things.
Now the other thing not mentioned here is the possibility that the smell is actually gray water smell. In addition to giving it a good scrub with water softener solution liquid detergent, check your vacuum breakers that are located under probably both the kitchen and the bathroom sinks. Right around where the P traps are, you will see a pipe that sticks up. On top of that pipe, is something that looks like a vent cap. They screw on to the pipe. If the vacuum is bad, they will emit odor back into rig that smells very similar to black tank. Also, when traveling, always close the drains on the sinks by putting your plungers down in the closed positions. This will prevent a vacuum action of draining the P traps with moving and allowing gasses to come back up from the gray tank.
If you bought this used, extensive scrubbing and cleaning is a very good start.
One more thing, if the above helps but you still have some smell. Look at installing the Lil' Stanker that is in our rvupgrade store. I just did and will be posting a product evaluation on it in the next day or so.
Mike </div></BLOCKQUOTE> Get some enzymes at local dept store or Wal-Mart or home improvement store . use plenty of water in tank fill it add enzymes leave for a few days ,do the same to the gray water tank use enzymes in each drain pour in and add about a quart of warm water to each trap. let stand as above .The enzymes will clean out the pipes and tanks of all organic material .As to the use of ice cubes all the ice will do is cool down the mess in the tank . Check as others said the vent ,for obstruction or to long sticking down in to the water in tand , or cap causing over pressure .To check over flow just hold open the valve and watch if it works by letting the water over flow the valve area with out letting it out of the rim of the bole .Do not use the blue stuff in place use Enzymes or nothing as you will supply the Bactria and that will work but thats up to you . I use the Enzymes and no problems at all also use them at home in all the drains. For those that put Ice in the tank if you think about it Ice floats on top of the water ,warm water melts the ice square corners soon round the bottom of the tank will only have water to move around Also by the time you get on the road the Ice is melted. Waste of time and or money. Ever one seems to think this will work but none have looked at the action in the tank to see if this is what in happening .Its just BS some one thought of . Skipper entry level over fifty years.
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