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Old 10-29-2014, 12:51 PM   #1
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black tank question

I have a 2000 36" National Dolphin. I need some info on flushing the black tank. The manual says "A pipe built into the black water holding tank that is connected to a source of pressurized water via a hose that is used to help flush solids from the holding tank at a dump site. If using a black water tank flush system in a campsite, the use of a back-flow preventer on the end of the hose to prevent sewage from flowing into the potable water system is recommended." I don't understand why a back flow preventor would be necessary as they are two separate systems, one hose for fresh water fill and one for flushing. The only reason I could think of is is you would use hose for both uses. Any thoughts would be appreciated.

Doug
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Old 10-29-2014, 01:00 PM   #2
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The way I understand this is that the back-flow preventer keeps back-flow from the CAMPGROUND water supply if you have the hose connected to the water faucet at your campsite.
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Old 10-29-2014, 01:01 PM   #3
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Quote:
Originally Posted by boeingair View Post
I have a 2000 36" National Dolphin. I need some info on flushing the black tank. The manual says "A pipe built into the black water holding tank that is connected to a source of pressurized water via a hose that is used to help flush solids from the holding tank at a dump site. If using a black water tank flush system in a campsite, the use of a back-flow preventer on the end of the hose to prevent sewage from flowing into the potable water system is recommended." I don't understand why a back flow preventor would be necessary as they are two separate systems, one hose for fresh water fill and one for flushing. The only reason I could think of is is you would use hose for both uses. Any thoughts would be appreciated.

Doug
Hi, Doug. Wow, you have a 36" Dolphin! And I thought my 33' Dolphin was a bit small (sorry, could not resist!).

I use a sanitary hose for the fresh water/city connection. I use a "dirty" hose to connect to the black tank flush, and to rinse the slinky, etc. I keep the hoses separated from each other during storage. My Dolphin has the back-flow valves built in behind the wet bay panel, so check yours to be sure what is actually there. Hope this helps!

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Old 10-30-2014, 11:03 AM   #4
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If you have the Swan Sani-T-Flush it has vacuum breaker (backflow preventer, anti-siphon) in the system to prevent backflow of sewage into the water system. Maybe some other systems don't have the vacuum breaker the reason for the warning. Below is a link to Swans wed site. Attached is the manual for the flushing system.

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File Type: pdf 2013-SFS-Manual.pdf (559.1 KB, 25 views)
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Old 10-30-2014, 11:25 AM   #5
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Originally Posted by TinCanTee View Post
The way I understand this is that the back-flow preventer keeps back-flow from the CAMPGROUND water supply if you have the hose connected to the water faucet at your campsite.
TinCanTee
Correct
A vacuum breaker, (aka: back-flow preventer ), is used to prevent anyone from contaminating the CAMPGROUND water supply.
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