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Old 02-25-2012, 12:18 AM   #1
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Has anyone else had this issue? Picked up our brand new ST25RB Feb 3rd.......took it to Tropical Palms Resort Kissimmee Florida (where I am currently writing this). Went to empty black tank for first time, and when trying to rinse with "San T" hose connection on side of trailer....took a looong time for black tank to even get to 1/3rd full. I can hear & feel water running in hose, and see small trickle water flowing into sewer hose when left black valve open, but when I shut black valve...even after 1/2 hr was still not even 1/3rd full. I had to add water to black tank by filling & emptying toilet inside bathroom in order to fill tank to point of full flush when opening valve outside to empty. Is this normal? Also when water running through "San T" rinse I can hear a vibrating sound coming from under our bathroom sink where "San T" outside connection located on our trailer. Traced hose under bathroom sink going to some sort of black "thingy", I beleive to possibly be a one way backsplash valve, which feels like it is vibrating. Any help from you experts out there would be greatly appreciated. Ive seen youtube video's of them rinsing black tank with this "San T" connection, and it seemed to have a better & faster water flow....
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Old 02-25-2012, 03:48 AM   #2
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Over 4 seasons of use with my ST I've found varying degrees of success with the flush depending on the water pressure of the campground I'm in. Most worked O.K. but some with low pressure took longer. Worst was one on well water who advised at check-in that theirs was so low that I shouldn't use a pressure regulator at all. Couldn't hear any spray sound from the flush so used the "fill the toilet & flush" method you mentioned. Wish I was parked next to you in Florida!


P.S. There have been times when the water flow seemed slow so I removed the pressure regulator which helped.Edited by: coastn
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Old 02-25-2012, 04:17 AM   #3
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Water pressure is actually pretty good, judging by flow into toilet, & kitchen & bath faucetts. Its probably the flush head mounted on black tank. The holes are probably tiny in order to increase flush action pressure inside tank, and probably the norm. I'm gonna assume that I'm only going to use this flush system to "aid" in cleaning, and will just "fill the toilet & flush" like you said a couple dozen times. Never had a black tank flush on any other trailers we've owned. I'll just clean black tank like I always have in past. Not really a big issue I guess. Thanks for the reply.
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Old 02-25-2012, 06:07 AM   #4
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It's possible the sprayer is clogged which means pulling down some of the membrane, removing the tank end of the hose and cleaning the filter. I have had to do this a few times. Fortunately on my rig, the membrane can be loosened at the side and my arms are long enough to reach the connection. A wand won't work on the 30SK as the toilet plumbing is not a straight shot to the tank.



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Old 02-25-2012, 08:15 AM   #5
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Mine didn't work when new. When winterizing blew out line with compressor (at 40 PSI) and heard a delayed whoosh and thought it blew it self clean. Now works great.
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Old 02-25-2012, 09:06 AM   #6
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I experienced the same thing with the ST25RB. One trip I felt like the "San T" flush was broken, then the next trip it worked fine. I think it was as coastn stated that the pressure was different at the two camp grounds. Still trying to figure out.
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Old 02-25-2012, 09:17 AM   #7
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Right-Wrong-or Indifferent, but I never "fill" the tank when using the San-T hose connection. I use a clear 45 degreeelbow at sewer connection, just turn on the water, leave the dump valve open and when the water runs clear shut it off. Takes about 3 or 4 minutes and you're done. Supposedly the San-T is designed to wash all the walls of the tank which should be more effective than filling the tank and then emptying it by gravity.
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Old 02-25-2012, 09:18 AM   #8
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Once we get back home from vacation, will be taking trailer back to dealer for seized front stabilizer jack motor, so I'll get them to check it then. Like the idea from we-canoe about connected air compressor and "blowing" it out. If there's something clogging those holes , that sure will clear 'em out! Thanks for all the input folks...much appreciated.
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Old 02-25-2012, 09:29 AM   #9
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Hey Sirsea.....I thought that was basicallywhat the San-T hose connection did, but if it's going to take as long as it does to clean tank that way, then I definately like your way with the clear elbow with hose connection. Will wait and see what dealer says, when take it back for another non-related issue. If I get nowhere with them, then will definately do what you suggested. Thanks again.
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Old 02-26-2012, 02:05 AM   #10
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I live in both worlds. I have another smaller trailer (Coachmen) that I take on solocampground scouting and golf trips in January to briefly get out of the snow. The Coachmen doesn't have a black tank flush so I use the clear elbow with hose connection already mentioned. It works very well and as a bonus you can close your black and/or grey tank valves and keep the water from the hose running and it will rinse your sewer hose sparkling clean. None of those holding up one end of the sewer hose while trying to rinse with the water hosegyrations. Am going to add one to the Sunset Trail when we head out next month, then I'll have the bases covered.

Edited by: coastn
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