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Old 06-30-2012, 08:24 AM   #1
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Flush King vs. internal spray system

We have decided to sell our '85 AS and purchase a much newer model from a friend. This past March I purchased a flush king reverse flush valve. It worked very nicely. We had not been getting proper flushing of the black tank and the bathroom often had that " Bathroom smell". One series of flushes with the flush king and finally being able to get a much better flush and no more smell in the bathroom. And it's been sitting now for 3 months. So I was duly impressed with the effectiveness of the flush king and would highly recommend it.

Now to my question, the new AS we are purchasing has the internal spray flush system. The friend we are buying it from says it works nicely and feels that he always has gotten a complete flush. Should I keep the flush king or leave it to the on board flush system to do a thorough job ???? I will include it with our outgoing AS as a gift to the new owner if so.

Thanks all, See ya on the road sometime
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Old 06-30-2012, 08:31 AM   #2
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I've not use Flush King or any other aftermarket flushing system. Our '92 has a built-in flush and I think it works well.

Lucius
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Old 06-30-2012, 08:36 AM   #3
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I'm not convinced my internal flush does more than fill the tank with water. I would keep the flush king and pass advice to the new owners, not equipment.
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Old 06-30-2012, 08:55 AM   #4
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I am pretty careful about flushing our tank after we are done using our trailer. I use both the built in tank flush and the macerator "fill" (kind of like the flush king for filling the tank). The only difference I can see is the rate it fill the tank. The built in is much slower. Both work well. I only use the macerator when we are at home and need to empty the tank. I don't think you need both......
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Old 06-30-2012, 09:28 AM   #5
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I have had good results from the built-in flush. I use a short piece of hose to connect the flush inlet to the outside faucet on my Classic. When I am ready to hook up, I dump the black, start the flush, and let it run all the while I hook up. If I look down the toilet after flushing, I see a clean, white tank bottom. Most of the time, I don't even use chemicals and I never have odor.

Can't ask for more.
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Old 06-30-2012, 10:15 AM   #6
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I'm not familiar with the "flush King" per se, but if it is like the external I attachment that I use, "hydro-flush", I would keep it handy, even if armed with the internal flush system. I thought that I was pretty fastidious about flushing my black water tanks, and I was very familiar with the sound of the water rushing into the tank from the internal system. Over the years, the sound began to changing, from a clearly audible blast to the tank wall to barely audible hum, as if through a crimped hose. I opened the external connections of the system, but saw no kinks, so the problem lies somewhere internally. Now when I connect the system, there's absolutely no sound of running water. In other words, there's a life expectancy to the internal flushing system, and once it fails, I'm not sure what can be reasonably done to restore it. Even when it was working well, I had experiences where after several days of camping with full hookups the solids formed a plug at the drain pipe, and allowed no evacuation, even with the valve open, and despite following good sanitation practices, i.e, I kept the black drain closed until I needed to dump. The internal flush provided no relief from these blockages. I had to hook up and drive around. Now, I keep the hydro flush, probably similar to the flush king, to blast the plug out of the way when that happens,which is rarely, but it is the only solution if it does.
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Old 06-30-2012, 10:46 AM   #7
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I believe that most newer trailers are plumbed as ours is. Both gray and black water tank drains have 2 ninety degree bends before arriving at the outlet. Therefore any system attached to the outlet is basically just going to be filling the tank. No jet of water is going to survive those two bends with much force left. Supposedly the built in system sprays the walls of the tank. I have no idea how effectively it does that however. I guess not very.

My experience is that both type systems work equally well at flushing the tanks, but the built in one is significantly slower.

I have a SewerSolution. When traveling I use it to back flush the tank. When I get home, I use the built in system after the SewerSolution, because I think it may clean the Walls better, and I have the time to wait for it.

Ken

P.S. The best thing to do, if you want to make the job difficult, is to let the tank stand for a significant (week or two or more) amount of time with just a small amount of waste in it. Then try both methods, and let us know how it turns out.
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Old 06-30-2012, 11:11 AM   #8
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Very good results with the on-board flush system on city water....not so much with the water pump.
It helps a lot being able to dump'n'flush on the pad.

A 1/4 cup of Dawn AFTER every 3rd or 4th flush helps also.

DO NOT add the Dawn and then flush......

Bob
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Old 06-30-2012, 11:42 AM   #9
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Thanks for all the suggestions. I'm leaning towards keeping it. I have read some threads of the internal systems loosing efficiency or failing eventually. So rather than needing to purchase another one I will just keep mine as a backup. I gather, as mentioned, that it is merely a way to fill the storage tank and then simply allow the
increased volume to flush the tank. Seemed to work nicely for me. '

Thanks all,
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Old 06-30-2012, 12:29 PM   #10
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Quote:
Originally Posted by ROBERT CROSS View Post
Very good results with the on-board flush system on city water....not so much with the water pump.
It helps a lot being able to dump'n'flush on the pad.

A 1/4 cup of Dawn AFTER every 3rd or 4th flush helps also.

DO NOT add the Dawn and then flush......

Bob

Bob,


How long have you been using Dawn, and I guess you have no seal problems, right?

I understand that Dawn is a degreaser.

I mean, Thetford makes a lube to put in the tanks to help lube the seals, so do you use some of that after using the Dawn?
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Old 06-30-2012, 12:31 PM   #11
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Quote:
Originally Posted by polarlyse View Post
Thanks for all the suggestions. I'm leaning towards keeping it. I have read some threads of the internal systems loosing efficiency or failing eventually. So rather than needing to purchase another one I will just keep mine as a backup. I gather, as mentioned, that it is merely a way to fill the storage tank and then simply allow the
increased volume to flush the tank. Seemed to work nicely for me. '

Thanks all,
If the internal system isn't used regularly, it will likely plug up. Then, when you hook up to pressure, it will blow the vacuum check valve and leak water into your under-pan. So, even if you don't use it as your primary flush system, it would be good to keep the water going through it to keep it functional.
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Old 06-30-2012, 01:12 PM   #12
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I get that Friday. Use it loose it. Hmmmmmm sounds familiar.
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Old 06-30-2012, 01:21 PM   #13
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Quote:
Originally Posted by Bluto View Post
Bob,


How long have you been using Dawn, and I guess you have no seal problems, right?

I understand that Dawn is a degreaser.

I mean, Thetford makes a lube to put in the tanks to help lube the seals, so do you use some of that after using the Dawn?




Bluto,

Used it the first time about 4 years ago. Couldn't flush/dump on the pad back then, and I needed to get the black tank clean, used the "geo method". It worked really well, haven't mixed the concoction since, but do still add the Dawn every now and then. I just substituted the Dawn for the laundry soap. SFSG.


I have been known to use olive oil when winterizing and to clean flapper valve at Spring get ready......
Werked great to soften up the toilet seal on our 63 Safari too, just poured it in and let it sit for a couple daze.

Bob
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Old 06-30-2012, 02:27 PM   #14
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Quote:
Originally Posted by ROBERT CROSS View Post

A 1/4 cup of Dawn AFTER every 3rd or 4th flush helps also.

DO NOT add the Dawn and then flush......

Bob
Robert,

What is the Dawn for, to clean it? Do you use one of those packets that supposedly help the microbes "do their thing", whatever that means?
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