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Was there any water or chemical added to the tanks before you started using them?
Yes, I am here.........very busy this morning!
The gray tank should empty out without having had any water in it. Be sure that you don't have 2 gray tanks and one may be empty already. The valves for a model with two will have valves in two different places and the second one is not where the black tank drain is. One the black tank there HAS to be added water and chemical in the tank BEFORE you use it or the solids won't dissolve and just block up the tank exit.
If that has happened here...........you will need to get some tank treatment and add and some water and let it sit for a few hours and hopefully it will drain then. I recommend Happy Camper Extreme Cleaner when this happens. Available directly online on Amazon if your local dealer or shop doesn't carry it.
IF these are cable valves, they may need adjustment and may not be actually pulling the valve blades open when you pull them out.
I will make a phone chat option offer for you in case you think that might be more productive and quicker. No time limit on calls or on multiple calls.
It needs more time than that and should be added with about 5 gallons of water EACH time you empty the tank. If you wait until now, it will take quite a while to work unless it is the Happy Camper product. Get some of that so you have it. Use RV toilet paper as well. Regular TP won't dissolve well in this system.
You can buy an add on valve and tank flush that uses the black flush system and a garden hose. That can be helpful when you have a clogged outlet in the tank. Valterra make them and you can find them online at Amazon or other RV outlets. Camco makes one as well. Theirs is called a "Dual Flush Pro" and is about $40 or so. Valterra's is called a "Hydroflush"
Doubtful..........at least not until the chemical has time to work.
Yes........and more chemical. I would add about 5 gallons of water and twice as much chemical.
Since I never hear anything back from you, I am thinking you were able to resolve this issue, but if not, please get back to me and I can assist you in tracking down the problem.