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Old 12-05-2010, 11:32   #1
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Fresh Water, Gray Water and Black Water Holding Tanks

Where is the best place to find gray water, fresh water, and black water holding tanks? Who has the best prices? Also, best place for marine toilets? Thanks!
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Old 12-05-2010, 12:24   #2
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Greetings and welcome aboard the CF, vweber.

Where are you located?
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Old 12-05-2010, 12:25   #3
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Thanks. I am in Austin, TX.
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Old 12-05-2010, 12:48   #4
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Check out Ronco & Moeller/Sceptre
Ronco Plastics - Marine Water Tanks, RV Water Tank, Auto Detail Tanks, Water Tanks
Moeller Marine Online - Water/Waste Tanks
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Old 12-05-2010, 13:56   #5
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Thanks. Do you what size tanks (in gallons) most people use for gray water, fresh water, and black water?
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Old 12-05-2010, 14:03   #6
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What size & type (model) boat?
What purposes (offshore, longterm coastal & week-ending, etc)?
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Old 12-05-2010, 14:09   #7
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The size is a 50' pontoon boat. We are making it into a party barge that people can rent for different events, and it will have a bathroom with a shower and a little kitchen area with a sink. It will get a lot of use over the next several months. Going out on the lakes is very popular here in Austin during the hot weather.
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Old 12-05-2010, 14:48   #8
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Consider Sealand for blackwater tanks. See here: SeaLand® Holding Tank Systems

And the Whale greywater setup: http://www.whalepumps.com/marine/product_list/13/128/
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Old 12-05-2010, 16:31   #9
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Thanks for all of the great websites. I am still wondering how many gallons each of these tanks should be. There are so many sizes and I'm pretty new at this...first boat I've owned. It didn't have any of these things on the boat, so we're adding them on ourselves.
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Old 13-07-2018, 19:18   #10
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Re: Fresh Water, Gray Water and Black Water Holding Tanks

That's mostly not a boat question. Your Department of environmental conservation/EPA will have conservative (i.e. large) estimates for how much water use various activities (bars, restaurants, etc. use). Or guestimate yourself. You'll want your people to be comfortable, and not, towards the end of the party, not be able to use the toilet.

The boat part comes in: where to put it and balance it. Start measuring voids...
I'll have a tequila sunrise, thanks :-)
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Old 13-07-2018, 20:25   #11
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Re: Fresh Water, Gray Water and Black Water Holding Tanks

Ronco Plastics Ronco Plastics marine Tanks is your best source for a tank. They make TOP quality thick-walled water and waste tanks for a very reasonable price and have more than 400 shapes and sizes, over 100 of which are non-rectangular, and they install fittings in the sizes and locations specified by the customer when they make the tank.


As for the best place to buy marine toilets...that depends on the type of toilet. For the kind of use you describe I think you want one that's a no-brainer to flush and impossible to clog...and that would would be a direct drop RV toilet..just step on the pedal to open a the trap door in the bottom of the bowl and start the flush water...and everthing slides into the tank. That would require installing the tank directly below the toilet, btw. Any of the Dometic 300 series shown here https://www.dometic.com/en-us/us/pro...tation/toilets would be a good choice.

Gray water can legally go directly overboard, so your tank only has to hold toilet waste. The RV gravity toilets connect to the boat's fresh water plumbing, but only use about a pint a flush...so I'm guessing that a 50-60 gallon tank, fairly shallow since it'll hang between pontoons, would be about the right size unless you plan to carry a "cast of thousands" onboard. Plumbing is very simple: a vent line and a pumpout line.

You're welcome to give me a shout if you'd like to discuss in more detail than is practical in a forum.

--Peggie
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