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Old 07-29-2013, 07:00 AM   #11
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Location: Stromsburg, Nebraska
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The mass of water will give a "whoosh" effect on the way out and helps pull out any solids on the way. I too, empty when not 2/3 full, but usually fill the tank with the black tank flush as I'm dumping.

Originally Posted by Dovetail View Post

Not sure i understand the 2/3 rds full suggestion. If we are camping for a few days, i will dump before going home. If on the road, will do it every second or third day. Guess it is because i dont want to haul the weight.

If stationary, i let it go to the 2/3 level.

Why is it better to let it get pretty full before dumping?

Joel and Teresa
2016 Sabre 34TBOK
2006 GMC 3500 CC LB DRW 4X4
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Old 07-29-2013, 07:11 AM   #12
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Location: South Eastern PA
Posts: 21,376
Not having enough water in the back tank is the number one reason for black tank problems.

Dry campers have the absolute worst time with the black tank because they have a tendency not to use enough water when they flush (trying to maximize time between dumps). This is false economy because the solids will pile up under the inlet for the tank and become "the mountain of doom" blocking the dump valve.

They also use a dump station that has a line (typically), and being the nice campers that they are, feel bad about using the Turboflush (if installed - and it should be!); so they don't. This makes filling the black tank to the "full light" even more critical when you head to the dump station.


Lou and Laura with Bella - German Short Hair Pointer
2008 GMC Sierra 2500HD Crewcab SB Allison Duramax
2010 Flagstaff 8526RLWS - Superglide 3300
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Old 07-29-2013, 08:01 AM   #13
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Makes sense.

Power flush +
Clear outlet connection +
GEO method =

Happy campers!

Rick and Linda, Lindale, TX
2011 Flagstaff 8528 CKSS
2006 F350 SW
Camping nights 2013: 130
Camping nights 2014: 17
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