No body has mentioned it yet, so I will. More than likely, your Jayco will have a black tank flush inlet that provides the capability for you to add water to your black tank from the park's water faucet. You will need to get a hose bib "Y" connector that has shut off valves on each outlet and a one-way check valve that you will put on one of the Y's outlet connector. From the check valve you will need to have a "green" garden hose that you will use for this purpose only, and connect the other end of the green hose to your black tank flush hose connector (usually on the panel with other tank connections). On the other Y connector you will need a "white" potable (drinking) hose for your fresh water.
In the event your Jayco doesn't have a black tank flush connector, you can purchase a "kit" that will serve the same purpose. Look on campingworld.com and search for "Quickie Flush" or "Tornado". Both are fairly easy to install.
When you get ready to empty your black tank, turn on the green hose to put water into your black tank while draining. This will spray inside your tank and help remove any tp or solids stuck to the tank's walls. Once the black tank is empty (you will need a clear connector at the drain to know when the tank is empty). Close the black tank valve and continue to put water back into your black tank and refill to 1/2 to 3/4 full and then open the drain gate again and empty the tank. With the clear connector you'll be able to "see" if the tank is empty of tp and/or solids by the water coming out. If it's clear, close the gate and turn off the green hose.
Then you can open the gray tank valve and empty it, or with the above flush system, there is really no need to keep the gray tank valve closed and you can keep it open all the time.
Chemicals are typically used for "odors". However, the black tank is a sealed unit (except for the vent on the roof) and you should never have any odors if you keep the tank clear of solids every time you empty it. Most chemicals used for the digestion of the solids take several days...maybe even a week or two.. to turn the solids into a liquid......so therefore, are pretty much useless in an RV application.
One method used (and mentioned) quite a lot here on rv.net is the use of a water softener (such as Calgon) to put into the black tank with several gallons of water when you are traveling. The water softener will coat the inside of the tank and make it slick enough that most tp and solids won't stick to it. You can even add some liquid laundry detergent to the water and softener to help the cleaning action of the sloshing water when traveling. Empty once you get home and put several gallons of clean water back into the black tank until you camp again. Since your new trailer is a 2011, I'm assuming it is used. Nevertheless, before you hit the road for the first time, try this method with the water softener. If it's still new, all the more reason to try it.
Hope I didn't add more confusion to your existing confusion. Congratulations on your new camper. Be patient, you'll eventually get experienced to offer info to newbies like yourself.
In any case, when using the toilet, use the least amount of tp you can get away with and put extra water in the toilet bowl when you flush it. The more water in the black tank, the better it will drain.
See ya...
Ron
