2019 25' Flying Cloud
Airstream - Other
Airstream - Other
North Central Texas
, USA
Join Date: Jan 2004
Posts: 1,003
I'm not sure that 3 gal. is way bigger (we have the FC25-RBT 31-blk, 34-grey ~9%). Besides my black tank is always 'pre-charged' with about 3 gals to prevent pyramids.
When we boondock or have days between pump-outs we will use plastic bowls in the bath and kit sinks. If need be, they get dumped into the black tank.
It's good to have a lot of water in the black tank.
It may also have to do with load distribution &/or plumbing for any given floor-plan.
I like the idea of dumping grey water from the sink or shower into the black tank. That will help them fill up more evenly as well as stopping the pyramid affect!
a 23FB has a 17g black and 37g grey tank while the 27fbt has 40 and 35g respectively. that is almost 2.4 times larger grey and a decrease in black versus the 23fb.
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2021 International 27 FBT - 2019 F150 Harley Davidson
2017 FC 23 FB - 2002 Range Rover
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Driggs
, Idaho
Join Date: Sep 2020
Posts: 6
Grey and Black tank capacities 23FB
Does anyone have any experience with replacing the tiny 18 gallon factory black tank on the 23 FB with a larger tank? Hoping to get up to 30 gallons or more so we can boondock for more than just 4-5 days at a time.
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