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Old 02-16-2021, 11:09 AM   #1
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what size drain hose for grey water only

Since we are using a composting head and will only be dumping grey water, is a 2" or 2 1/2" hose adequate? I realize that it will mean using an adaptor to connect but not having to wrestle full size hose is a plus and storage easier also. But, will it work?
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Old 02-16-2021, 11:27 AM   #2
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I can't see why it wouldn't work. If you have a strainer in your kitchen sink, it would primarily be just dirty, soapy water..
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Old 02-16-2021, 12:49 PM   #3
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Quote:
Originally Posted by Rivetboy View Post
Since we are using a composting head and will only be dumping grey water, is a 2" or 2 1/2" hose adequate? I realize that it will mean using an adaptor to connect but not having to wrestle full size hose is a plus and storage easier also. But, will it work?
Rigs that use a macerator for black water typically discharge into a 1” smooth bore hose or even “garden hose,” so this seems reasonable. However, I would make sure to look for an RV adapter first for your intended hose/connections, before you buy hose or start construction. Cheers, Kev
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Old 02-16-2021, 02:04 PM   #4
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My outlet on the two graywater tanks is 2" but I couldn't source an adapter/connecter and hose, so I've just put a 3" adapter on the ABS drain lines and have the standard 3" hose. I'd have loved to have the smaller hose so if you have a source, let me know!
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Old 02-16-2021, 03:08 PM   #5
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Amazon - Clean Dump (CDHV-20) 20' Length Discharge Hose with Drip Proof Valve

https://www.amazon.com/Clean-Dump-CD...3509607&sr=8-1
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Old 02-16-2021, 03:09 PM   #6
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Amazon - Clean Dump (CDHV-20) 20' Length Discharge Hose with Drip Proof Valve.
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Old 02-16-2021, 03:48 PM   #7
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2 " hose

Found this so there is fittings also I am sure. Also was looking at pool vacuum hose.

https://www.ebay.com/itm/231924741640?chn=ps
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Old 02-16-2021, 03:56 PM   #8
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And here is your electric 2" drain valve. Rainbird 2" commercial electric valve Just search on ebay link was stupid
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Old 02-16-2021, 03:57 PM   #9
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Search for truck vacuum hose
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Old 02-16-2021, 04:39 PM   #10
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That is a smooth wall 1" hose-a bit too small to drain properly, even graywater, I think.
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Old 02-16-2021, 04:42 PM   #11
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I think you meant 'vacuum cleaner hose'? Those don't have watertight fittings.
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Old 02-16-2021, 04:46 PM   #12
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I rented an RV to get a feel for draining the tanks last year and speed was definitely something to keep in mind, especially in 105+ temps. I'm happy with my decision to upsize to 'standard RV waste hose' and the associated quick connect.

I haven't commissioned the tank yet, so I can't give you a sense of how well it works, but I'm happy it is a standard setup so if I lose the hose I'm not specialty-searching and waiting a week for a replacement.
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Old 02-27-2021, 09:01 PM   #13
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No grey water only needs 1 1/2" except drain on regular shower pan's they take 2" but can be reduced down to 1 1/2"
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Old 02-27-2021, 11:08 PM   #14
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I'm using 1 1/2" corigated hose for grey water. I use cam lock on the ends. Have 2 hoses that can connect to each other for long runs. Made a cam lock to 3 inch for rv parks.
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Old 02-27-2021, 11:58 PM   #15
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I'm using only grey tank with a 4" male connection. My tank sits under the bus between the frame rails. My tank holds about 40 gallons, yet I have 80+ gallons of fresh water. More about this later.

I ran 4" all the way to the the side of the bus with a normal RV twist on sewage hose connection.

Just before that 4" RV twist connection, I put in a Y. One side had the 4" and the other a 2" opening. I adapted down the 2" to a standard water hose thread with a on-off valve (see attached pic)

Why?

When I want to dump fast at a dump site, I use the standard 4" port. This also assures any "small" items that may have made it to the tank exit with no issues.

The water hose connector allows me to use this trick.
Attached Images
File Type: jpg GardenHoseShutoff.jpg (48.5 KB, 6 views)
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Old 02-28-2021, 08:57 AM   #16
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I don’t understand why you wouldn’t just use the stock 4” stuff. I guess maybe if you had a long run to the sewer it would make sense, but then just using the 4” cap with hose connector would solve that.
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Old 02-28-2021, 09:22 AM   #17
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I'm sorry I misunderstood the question completely. Yes of course you use the largest you can to dump faster. Forgive my mistake Jerry
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Old 02-28-2021, 10:29 AM   #18
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Since I installed a macerator pump I use a 5/8" garden hose to drain both the black and grey tank. Never again will I use a stinky slinky.
Jack

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Old 02-28-2021, 10:59 AM   #19
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Quote:
Originally Posted by ol trunt View Post
Since I installed a macerator pump I use a 5/8" garden hose to drain both the black and grey tank. Never again will I use a stinky slinky.
Jack
What drives me nuts about using our macerator is just how long it takes to get the job done. Running 3" the whole way from tank to slinky to dump, it takes two minutes to empty 40gal black (NOT in winter), four minutes to empty 90gal fresh. With the macerator draining takes much longer.


I like the way you built it in, though. Only way to get the stinky uphill.
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Old 02-28-2021, 11:53 AM   #20
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Quote:
Originally Posted by ol trunt View Post
Since I installed a macerator pump I use a 5/8" garden hose to drain both the black and grey tank. Never again will I use a stinky slinky.
Jack

.

.
Holy Crap (pun intended), that's a hell of a sewer setup! Great job!
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