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Old 11-22-2013, 08:05 AM   #1
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Bladder tank for gray water

While camping at state parks that do not have a sewer connection at each site we found the black tank can go over a week so one trip to the dump station was not a problem in a two week stay. Both of us using the shower every day used up the gray in three days or less even when trying to conserve. Looked at the "blue thunder" tanks on wheels but really didn't have a good place to carry one. After talking to a neighbor at a CG that had a bladder or pillow tank I looked into them. Not many sources but I found a 25 gallon one here Water Storage Tanks | Tanks for Fuel and Water Storage They were very helpful and followed up after the sale.

The top of the tank has a 1 1/2" opening and the side a 3/4" threaded. For the top I used a 1 1/2" to 3/4" pipe thread PVC coupler then a 3/4" pipe thread to garden hose nipple. The side opening just needed the nipple. 90 RV hose adapters worked well to turn the connections. An old garden hose was used to change the gender so the female end could connect to our macerator. Shut offs are on almost every connection for obvious reasons.

At the dump station I use a utility pump from Harbor freight and short piece of garden hose. A jump start box works well to power both pumps.

At 25 gallons it holds about half the capacity of the tank so a couple of trips a week does it. I'm not sure if I have the courage to try it with the black tank
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Old 11-22-2013, 09:29 AM   #2
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Interesting idea Mark! Thanks for sharing!
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Old 11-22-2013, 10:10 AM   #3
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Had one on our boat for black use. Never again!
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Old 11-24-2013, 07:28 AM   #4
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Quote:
Originally Posted by Clayobx View Post
Had one on our boat for black use. Never again!
Why Clay, did it leak?

I find that almost nothing leaks using it for the gray if I am careful. A little leak of gray water is easy to deal with compared to black though.

To do it over with the cost, building it and fooling around to use it buying a blue thunder tank may have been the way to go. The big problem is where to carry it. The ladder already has bikes on it. I could attach one of the rectangular metal carry things that hook up to a tow bar receiver and already own one but that will wait until next fall.
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Old 11-25-2013, 08:24 AM   #5
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Mark, the tank, bladder was under the fore peak of the guest cabin. While at sea it sloshed around. You could never evacuate all the waste due to positioning. In your case, pu bed, you might get away with it. Good luck!
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