Blac Water Flush

[martybmw]

We hace a 21 Alpine 3700 FL and wondering about the black flush. When you connect a hose to i, I am assuming it just fills the black water tank but there is no kind of pressure to help clean off the side of the tank.
thanks

 

[Cilrah72]

Get one of those new fangled thing-a-mabob that you stick down your toilet and has a sprayer head.

 

[Cilrah72]

Here you go

 

[workinonit]

It's not just a fill, it's at least one but I think mine has 2 spray nozzles in the tank. Mine cleans the tank pretty well.

 

[chuckster57]

Black tank rinser/flusher will have a sprayer with a number of holes to direct water spray in a pattern like a lawn sprinkler. Depending on its placement it should rise the walls and help move solid waste towards the drain.

 

[workinonit]

Mine does an adequate job but it does take a bit of rinsing to get the tank clean.

 

[flybouy]

The pressure is the supply water pressure, the same pressure as the faucets inside have. There's no separate pump to increase the pressure to that device. As explained by others, the tank rinser is mounted thru the sidewall of the tank and sprays out via a number of small holes in the head. The tank rinser acts similar to the old style seperate sprayer on sink faucets.

 

[JRTJH]

Seems a lot of people "imagine an effective spray pattern similar to a pressure washer or jet nozzle garden hose spray"... That's not a good visualization of what's really in your black tank. Here's a video that actually demonstrates the three types of "spray heads" used in black tank flush systems. While these are "aftermarket modification kits", the ones installed as OEM black tank flush systems do use the same type spray heads, depending on "lowest bid supplier" and "manufacturer preference/availability of supplier who can meet the quantity/shipping schedule" needed by the RV manufacturer.

The actual "hands on spray pattern demonstration" starts about the 4:30 mark in the video. Take a look and then "conceptualize" that your black tank is about 5" tall, 24" wide and 60+ inches long. Trying to use that type "spray head" to effectively clean the walls on any black tank with a 3 or 4 minute flush after dumping the tanks is, IMO, more of a "feel good event" than it is an effective tank cleaning.

Here's the video:

 

[workinonit]

Creative methods are required to clean that black tank. Clean is a huge ask, I just want mine empty. LOL