OK
Generic , not all are exactly the same..
(You might want to hold your nose before reading this..............)
And hope you're sitting down , this will take way longer than doing it will !
Assuming you have a dump hose and know where the dump valve is........
(If you don't have a hose buy the heaviest ,most expensive one you can get your hands on ,,,,Rhino makes the one I have now ,,,,not a place to save pennies here !!!) A 10' or 15' will work for most places.
It's best to wait till the tank(s) are at least 3/4 full the level lights are very unreliable on most rigs
(look down the toilet with a flashlight and don't drop it ! ) the grey water will back up into the shower if it gets full.) Usually the grey will fill up way sooner.....
There are a couple of hints that you will learn to recognize after a few times,,, the toilet will burp and the shower drain will gurgle...time to dump ! If the grey isn't full when the black is run some water till it is or at least close.
This will come in handy later ....
Get some disposable gloves and have a bottle of Purell handy so you can clean up easily before you go back inside.
Make sure both the black (the 3" pipe) and the grey (the 1 1/2" or 2" pipe) valves are closed ,push in till they stop.
Put an old dish pan under the valve first then...Twist off the valve cap and make sure there isn't any liquid behind it....if there is one of your valves wasn't closed or leaks and now you know why you had the dish pan. If no leaks you won't need it next time,,,,well , maybe !
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Twist one end of the dump hose to the valve opening and the other end goes into the dump station inlet.
(there are different adapters you can use on the dump station end if it has threads that help prevent leaks , if not there is a foam thing called a donut that will at least help with fumes. If no threads , have someone "hold" the end in place so it doesn't come out !!!! I sometimes use a couple of rocks or leveling boards but I've seen many variations ,,like a sock filled with sand. )
Make sure the hose ends are tight and slowly pull out the black tank valve handle till you hear the "water" flow till it is empty(at this point I like to go inside and fill and flush a few times to clean out the bottom of the tank and the valve blade area so I don't jam "anything in the valve which might lead to future leaks) ,,,close the valve and then open the grey tank valve , same procedure except without the extra flushing I i suppose you could run a sink full of water if you prefer. Just don't use any bleach it will kill all the good bacteria.....
Doing in this order will help rinse out the hose of leftover stuff from the black tank. Close that valve and carefully remove the hose from the valve end first . If the hose didn't go downhill all the way to the dump slowly lift the end and work your way to the other end till all the liquid flows out of it .
There are clear fittings you can get to help you see when it is done flowing and a few others you might find helpful like for flushing ... don't worry about what it looks like (,mostly like a lot of cocoa with maybe a little paper) . Skuh kuh kuh kuh just doesn't smell as good.
Some dump stations have a spigot and an old garden hose so you can rinse the hose and any leaks that might get away from you ! OhMyGoshk !
Now a cool hint , hang out near a dump station till someone else uses it and watch and ask any questions as they go through the process . If you're lucky they'll know what they are doing and will probably help you out too.
RVers are generally very friendly, just like vandwellers !!
Good luck and watch the movie RV after if you can !!!
