Gray tank drains slowly

Unless you're a Moderator, I don't think you can close a thread.

Am I overlooking a button? I don't see a way to close the topic to new posts.

Thanks for all the input. I'll start with the Dawn and hope it's that easy and economical.

As fulltimer who volunteers we set for several months at a time. Before we pull out for a new location I close the grey tank pour a 1/2 cup of Dawn down the kitchen drain and run the hot water till it turns cold. When we make our first nightly stop I'll get full hookups connect the flush king and do a reverse flush it really cleans out the gunk.

put a small bottle of Dawn down the drain, fill the tank and let it sit for a few days.

I don't use anything and never have a problem, but if I had a grease buildup problem, I'd keep some laundry detergent in the tank. Maybe if you'd use some dish detergent when washing dishes ???
Oh, but for the problem, I'd shove a running garden hose up there.....where the sun don't shine ? :)

my son had a grease plug in his and it drains so slow, so we used a knock off flush king to break it loose and it drains great now. I had an older TT I installed a quickie flush in and it kept the tank very clean.

There is also a drain cleaner that I bought at Home Depo years ago that is organic non-caustic and is made for breaking up grease and goo. Won't hurt plastic or anything and it wouldn't hurt anything to dump a bottle of that in the tank and let it sit for a day or two.

Probably a grease and food particle buildup if your kitchen sink drains into that tank.

Dick_B wrote:
How about one of those attachments (name escapes me, CRS victim) that allows one to back flush the tanks thinking that there might be a buildup in the piping. I'd back flush for 10 seconds at first to see what comes out and increase time if necessary.

That device is called a Flush King. Camco makes a knockoff available at Wang Mart.

Could be a blocked vent also. Usually the clogged outlet though, as mentioned above.