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Old 06-16-2016, 07:35 PM   #15
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I highly recommend having a clear elbow to view what's coming out of your black tank. I always use the AS flush connection when emptying the b-tank. Also, when the water coming out starts to look clean, my wife will flush a FULL toilet bowl of fresh water into the tank. You may be surprised what is loosened up with the flush (TP etc.) and comes out. Sometimes we repeat the flushing several times before it's clear. This usually happens if it has been a number of days since the last draining. Before winter storage, we do the ice trick - putting in a bunch of ice in the b-tank, via the toilet, and drive around for a while. Then we do the normal evacuation procedure.
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Old 06-17-2016, 08:45 AM   #16
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...surprised what is loosened up with the flush (TP etc.) and comes out.
A trick we learned from life aboard our sailboat was never put TP down the toilet as it tends to mound up and won't dissolve well. Most boaters have a waste bag in the head to keep the used TP. Another rule was nothing goes in the toilet that didn't first go through your alimentary canal (i.e. no TP, Kleenex, dental floss etc). These two things helped prevent problems with the black water holding tank and pump-outs.
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Old 06-18-2016, 08:59 PM   #17
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Assume this Camco clear elbow is better than the RhinoFLEX swivel elbow? Not sure which one you are referring to and where on the hose it goes.
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I have the Camco 45 degree clear elbow from Walmart.
It hasn't leaked in 6 years with my new Rhinoflex hose and it never leaked with the old hose.


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Old 06-18-2016, 11:34 PM   #18
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It is separate and apart from the sewer hose.
I connect it to the trailer then connect the sewer hose to the clear elbow.
I flush until it runs clear or I see no more solid brown chunks floating by.


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Old 06-19-2016, 12:30 AM   #19
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just to further this...

and not many will say this or recommend it, so take it as you will, and your mileage may vary, BUT

We use the factory flush connector, we make a solid 5 minutes with the black tank valve open.... and then we close the valve

My wife stays inside and keeps an eye on the black tank level... when it hits 80% we open the valve.

We close it again, and fill again, opening at 80%.

We'll do this a third time if needed. But we are always surprised at the extra stuff that comes out when we do this.

The DANGER is if you forget you're doing it and let the tank overfill. You don't ever, never ever, want to go there... which is why no one recommends you do this, not even me. But we do it..

Possibly a safer way to to do this is buckets from the sink into the toilet to fill up the black again. Holding the toilet open works too, it just takes forever, and of course it's not pleasant with your nose right over it.... so when I use the toilet to add water (for instance, if we have only stayed two nights, but I want to dump and my tank is only 30% full) I'll hold the pedal just enough to fill the bowl, then open the toilet a little, and usually I can hit a spot where the water entering the bowl matches the flow of water out, and the water seals off the smell.
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Old 06-19-2016, 06:05 AM   #20
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I'm a newbie, trailer is coming in July, we'll be staying at a permanent spot unless traveling. When we are at our site, I assume the dump hose is always connected to the input sewer connector in the ground and we are still on tanks flushing when needed. Is this true?
I stay at a permanent spot all winter and leave my sewer hose connected, but I leave the gray and black valves closed. You DO NOT want to leave the black valve open all the time. Bad things WILL happen! See my earlier post on this thread on how I dump.
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Old 06-19-2016, 06:16 AM   #21
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Before I head out on each trip and once a week while out before hitting the road I mix two cups of Calgon and a couple of gallons of HOT water and dump in the sinks and then the same in the stool. Calgon is a water softener. It will coat the tank and seems to keep stuff from sticking to it VERY well. Nothing bad in it, it is just like soft water when you dump.
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Old 06-19-2016, 07:52 AM   #22
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I stay at a permanent spot all winter and leave my sewer hose connected, but I leave the gray and black valves closed. You DO NOT want to leave the black valve open all the time. Bad things WILL happen! See my earlier post on this thread on how I dump.
A very big ditto on this issue! Leaving the black tank valve open while camping will result in what is called "Black Hills Syndrome". This dreaded condition can result in having to replace the black tank.

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Old 06-19-2016, 08:28 AM   #23
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In our 2015 23D, we have the small 18 gallon black tank just like the 19, 20, & 23FB. We also have the small 21 gallon gray tank like the 19 & 20 models. We always use the built in tank flusher system.

If the tank is not full, I turn on the flusher system to add volume to the tank and get the percentage close to 90% full and open the valve. When the flow is slow, I close the valve (flush water still running) and nearly refill the tank and flush again. If items of interest come past the view "window", I flush again. When the all clear message is visually conveyed, I close the black valve and open the gray tank valve. When it is empty, I close the drain valve and open the black valve and get another clean water flush of the hose. I turn off the water and then close the black tank valve.

BTW. Use a back flow preventer at the trailer connection water inlet to prevent contamination of the hose even with a dedicated flush hose.

We then add three gallons of water with our TankTecks product that helps keep the tank clean during the sloshing when going down the road. I also put that product with three gallons of water into the gray tank.

In the Classic with much larger tanks, after dumping we put in five gallons plus the tankTech but use the same dumping procedure.

Do not park and open the black dump valve. The solids will not flow away like in the house and there will become a real issue inside the tank if the solids accumulate.
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Old 06-19-2016, 08:38 AM   #24
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You are the first to mention Tanktechs. Any reason you settled on that product?
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In our 2015 23D, we have the small 18 gallon black tank just like the 19, 20, & 23FB. We also have the small 21 gallon gray tank like the 19 & 20 models. We always use the built in tank flusher system.

If the tank is not full, I turn on the flusher system to add volume to the tank and get the percentage close to 90% full and open the valve. When the flow is slow, I close the valve (flush water still running) and nearly refill the tank and flush again. If items of interest come past the view "window", I flush again. When the all clear message is visually conveyed, I close the black valve and open the gray tank valve. When it is empty, I close the drain valve and open the black valve and get another clean water flush of the hose. I turn off the water and then close the black tank valve.

BTW. Use a back flow preventer at the trailer connection water inlet to prevent contamination of the hose even with a dedicated flush hose.

We then add three gallons of water with our TankTecks product that helps keep the tank clean during the sloshing when going down the road. I also put that product with three gallons of water into the gray tank.

In the Classic with much larger tanks, after dumping we put in five gallons plus the tankTech but use the same dumping procedure.

Do not park and open the black dump valve. The solids will not flow away like in the house and there will become a real issue inside the tank if the solids accumulate.
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Old 06-19-2016, 11:54 AM   #25
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It's best to keep your black tank valve closed untill that tank is 3/4 full and then dump to the hookup.
Run the flush with dump valve closed untill. 1/2 to 3/4 full and dump again. Don't forget to add some water and chemical to that freshly cleaned tank.
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Old 06-20-2016, 02:12 PM   #26
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Is there a trick to making sure that the clear Rhino 45 degree swivel elbows don't leak?
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Old 06-20-2016, 02:20 PM   #27
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Tighten the locking collar?


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Old 06-20-2016, 02:47 PM   #28
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We also have a 2014 FC and the plastic vacuum breaker also leaked on us. Have not been able to get to a dealer to have it replaced. I would suggest confirming you have the new brass vacuum breaker as part of the black water back-flush system on your 2015, and you should be good to go.

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Is it best to use the OEM connection or go with something like a Rhino Blaster?

Also, how often should you do the flush?
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Our factory black tank flush leaked on our 2014 Sport. I thought it was a stupid device, so did not rush to get it repaired. I did eventually get it fixed (stupid cracked vacuum breaker), and now wish I had it repaired on Day One. I always fill the black tank prior to dumping, even if I have to just run in some water with the foot pedal. Dump, black tank flush on for 10-15 minutes, easy. We also have the clear elbow (wife hates it, thinks it is juvenile, maybe because I named it "The Turd Tunnel") and the water is usually flowing clear within the first couple of minutes. Easy.
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