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03-24-2012, 11:37 PM
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#1
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Weekend Camper
Join Date: Nov 2011
Location: appleton
Posts: 14
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Can anyone tell me how the holding tank flush works. I have two hose connections at my water station. One is for city hook up and the other says "flush". I'm assuming this is to flush my gray and black tanks or maybe just the black I'm not sure. If so, How do I use it. From what I have seen at dump stations the water supply's never have a threaded hose fitting that would work with a trailer. Makes sense because they don't want people to fill their potable water tanks. I have always seen a metal hook like water nozzle.
Thanks in advance
Mike
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03-25-2012, 12:06 AM
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#2
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Seasonal Camper
Join Date: Feb 2005
Location: Mid-Missouri
Posts: 458
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The flush is for the black tank only on our 30SKP. Generally near the dump station there is a fresh water fill also. May take some extra hose to get to it and the dump at the same time. I have had to use up to 50 ft. once.
__________________
2016 Duramax - 2010 CF30SKP
Viet Nam Vet 70-71 Da Nang
Real airplanes have two wings and big, round, engines
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03-25-2012, 12:19 AM
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#4
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Full Time Camper
Join Date: Apr 2006
Location: Ontario
Posts: 508
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Quote:
Originally Posted by mdunlop
Can anyone tell me how the holding tank flush works. I have two hose connections at my water station. One is for city hook up and the other says "flush". I'm assuming this is to flush my gray and black tanks or maybe just the black I'm not sure. If so, How do I use it. From what I have seen at dump stations the water supply's never have a threaded hose fitting that would work with a trailer. Makes sense because they don't want people to fill their potable water tanks. I have always seen a metal hook like water nozzle.
Thanks in advance
Mike
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IMPORTANT!!!! DO NOT USE YOUR FRESH WATER HOSE FOR THIS PROCEDURE. Instead buy a cheap 25 foot garden hose that can be stored separately from your freshwater hoses.
The flush connector is for the black water tank only. There is a spray header mounted inside the Black tank.
Drain your Black tank first then connect a hose from a water source to the flush connector and let it run for about 4 to 5 mins. Then drain the tank again. This should be sufficient to clean out the tank of any solid waste. Disconnect your flush hose at the flush connector and run some fresh water through it andthen disconnect it from the supply source. When you store your flush hose,DO NOT STORE IT WITH YOUR FRESH WATER HOSE(S).
Ifyoucan'tuse thetank flush, because you only have the "hook" nozzle then you'll have to wait untilhave the ability to flush it. The "hook" nozzle isused to clean outyou tankdrain hoseafter you've dumped your tanks. The dumping sequence for your tanks is from the dirtiest to the cleanest as follows: 1stBlack water, 2nd Gray water (kitchen), 3rd Gray water(bath).
Edited by: Hamops
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Cheers
Helen & George VE3INB and Max (Bichon Frise)
2006 Silverado 2500HD D/A,
2006 Cruiser CF30SK
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03-25-2012, 12:22 AM
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#5
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Weekend Camper
Join Date: Nov 2011
Location: appleton
Posts: 14
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Ok Thanks,
Do you keep your black tank valve closed while rinsing or rinse directly to the station"s dump out. Is there a spray nozzle in the black tank? Is there any risk of overfilling the black tank while rinsing if the dump valve is closed. I would imagine it would end up coming in the bathroom is that correct (no over flow protection). That would be ugly! My manual says nothing about any of this let alone mention the flush. I must say for the price they charge for these units they could spend a little more time developing a specific manual that goes with a trailer not a generic one. Attention to detail this entire industry lack!
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03-25-2012, 12:27 AM
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#6
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Weekend Camper
Join Date: Nov 2011
Location: appleton
Posts: 14
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Sorry I posted this last message before seeing Hamops reply.
Thanks I got it now
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03-25-2012, 12:33 AM
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#7
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Full Time Camper
Join Date: Apr 2006
Location: Ontario
Posts: 508
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Quote:
Originally Posted by mdunlop
Ok Thanks,
Do you keep your black tank valve closed while rinsing or rinse directly to the station"s dump out. Is there a spray nozzle in the black tank? Is there any risk of overfilling the black tank while rinsing if the dump valve is closed. I would imagine it would end up coming in the bathroom is that correct (no over flow protection). That would be ugly! My manual says nothing about any of this let alone mention the flush. I must say for the price they charge for these units they could spend a little more time developing a specific manual that goes with a trailer not a generic one. Attention to detail this entire industry lack!
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See my previous reply.
When you're flushing, leave the dump valve closed and let the water run for about 5 minutes, then open the dump valve. This will allow any solids in the tank to loosen and will be more easily flushed out of the tank. Turn off the flushing water and let the Black drain and then close the dump valve.
__________________
Cheers
Helen & George VE3INB and Max (Bichon Frise)
2006 Silverado 2500HD D/A,
2006 Cruiser CF30SK
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03-25-2012, 12:49 AM
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#8
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Seasonal Camper
Join Date: May 2010
Location: Coupeville, WA
Posts: 355
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Hamops, I don't see what the big deal is about using two different hoses. The black water tank flush is an inlet not an outlet. It should never see anything from the black tank.
I have a "Y" hooked up to the water inlets with and "Y" valve going to a single short hose. I hook my hose up to a single point and the flip the "Y" valve to either fresh water or flush. It works perfectly and I'm still alive
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03-25-2012, 01:15 AM
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#9
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Weekend Camper
Join Date: Nov 2011
Location: appleton
Posts: 14
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My flush hook up has a one way check valve. I just went and looked at it. It's apart of the hose hook up. I guess there is the chance of the check valve failing but the black tank would have to over fill to have fluid touch the valve to contaminate.
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03-25-2012, 02:19 AM
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#10
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Seasonal Camper
Join Date: Feb 2011
Location: League City, TX
Posts: 265
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I use awhite "potable" hose for fresh water and a regular green garden hose for flushing the black tank. Also attach a short section of each with quick couplings on one end toextend the hoses below the trailer to keep water out of the compartment when you disconnect. After flushing the tank I use the green hose and an adapter to flush the dump hose before storing it in the bumper.
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03-25-2012, 03:00 AM
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#11
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Full Time Camper
Join Date: Apr 2006
Location: Ontario
Posts: 508
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Quote:
Originally Posted by KennyB
Hamops, I don't see what the big deal is about using two different hoses. The black water tank flush is an inlet not an outlet. It should never see anything from the black tank.
I have a "Y" hooked up to the water inlets with and "Y" valve going to a single short hose. I hook my hose up to a single point and the flip the "Y" valve to either fresh water or flush. It works perfectly and I'm still alive
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Actually, I have "Y" valve as welland I haven't kicked thebucket either. I screw it onto the water supply valve. I connect the green flush hose to one valve on the "Y" and the drinking water hose to the other. When I'm in full-service campsite, I sometimes have to drain the black tank and that's when I use the flush system. I'll turn on the flush valve at the "Y" and the close the drinking water hose for the time being. When I'm ready to close the flush valve, I open the drinking water valve and then close the flush valve. I don't really have to do that but it helps to ensure that the flow is always away from the supply valve. I'll run water through the flush hose when we're packing up and I store it separately from my drinking water hoses.
__________________
Cheers
Helen & George VE3INB and Max (Bichon Frise)
2006 Silverado 2500HD D/A,
2006 Cruiser CF30SK
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03-25-2012, 03:29 AM
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#12
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Family Vacation Member
Join Date: Nov 2011
Location: Peace River, AB
Posts: 144
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We use two hoses - Blue for water and green for sewer. They are the coiled expandable garden hoses that you get at Walmart complete with a nozzel.
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03-25-2012, 04:03 AM
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#13
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Weekend Camper
Join Date: Apr 2011
Location: Illinois
Posts: 60
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Hi Mike,
Crossroads includes a San-T-Flush manual with their very complete set of information sheets. Don't know why you didn't get one. I know a lot of owners close the dump valve when their flush is operating to get more clean water into the tank. The owners book advises not to do that. One of my neighbors was doing exactly that when across the street yelled "Hey Fred got a second? During that time of assisting his neighbor he heard a bang and upon running back to his unit he found sewage had come up thru the toilet and was all over his interior carpet and the black tank had burst. The repair cost totalled in the thousands.
Good luck with the system, Bruce
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