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Old 05-13-2019, 04:44 PM   #1
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Gray tank question

I have had my Grayhawk for about nine months and have used seven or eight times. This time out gray water tank shows 1/3 full even though itís empty. Iíve sent post regarding black water tank sensors but not gray. Any thoughts on how I can fix it?
Thanks for any ideas.
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Old 05-13-2019, 06:11 PM   #2
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The sensors in all of the tanks are horribly imprecise. My gray water does this on occassion and then later in the day it will register empty. The issue is something greasey or slimey is sticking to the small probe (piece of food or something else).

At this time I am not aware of a good solution. Black water readings are usually worse due to TP floating around and sticking to the probe, but it is not unheard of on gray water.

Personally, I just ignore both of these tanks until they hit the 2/3 mark, then don't drain until I "guestimate" they are approaching full if possible. Allowing the tanks to drain when on the full side more thoroughly flushes the crud out.

One trick I have not tried yet, but saw on another forum is dump a couple of large bags of ice into the black tank, top it off and drive it around. The ice acts like a scrubber and loosens stuff up. Not sure how that would work with gray water though.
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Old 05-13-2019, 06:29 PM   #3
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As has been stated, the sensors for the tanks are very poor and often inaccurate. If I denote a problem with the grey tank, I'll empty both tanks prior to leaving a campground. Then I'll partially fill the grey tank with clean water and add some dish detergent and/or pine oil and a little of the powder I add to the black tank. Then as we are driving to our next destination, the water and soap are sloshing around in the tank, hopefully cleaning off whatever goop was causing the sensors to misread the level. Often, if we are enroute to a destination some distance away, and are doing several one night stays, I won't dump the tanks at each stop, which keeps the solids agitated and everything drains better. Plus I'm a firm believer in flushing the black tank with the black tank flush three or four times when I'm emptying the tank.
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Old 05-13-2019, 07:14 PM   #4
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I had the same issues with my 2007 TT. The black was solved with a flex spin wand through the toilet and teaching the kids it's ok to use water in the camper. For whatever reason, they like t ok run water at home but not in the camper???

Grey was tougher. Limiting the size of food particles down the drain imo is a big help. After draining the grey, I refilled with hot water and dawn dish detergent before leaving for the week. Came back following weekend, drained the grey and sensors have been working fine for over a season.

Keep in mind that we leave our camper sit during the season in the same spot.
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Old 05-13-2019, 08:07 PM   #5
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I read where dishwasher soap is good to use. I would think regular dish soap would suds up quite a bit. Suds sometimes leaves residue on things.

Just thinking outside the sink.
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Old 05-13-2019, 11:44 PM   #6
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I make sure that we dump some warm water and some dawn dish soap down in my gray water tank.
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Old 05-14-2019, 05:29 AM   #7
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All you can do is keep water in the tank, limit grease and large chunks of food from going down the drain.

I put some dawn and water softener in there with a couple gallons of water after dumping to slosh around.

They are woefully inaccurate and most just ignore them. I don't trust them even when showing empty.
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Old 05-17-2019, 09:43 AM   #8
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Do what I am about to do.
Replace them with Valterra T21302VP Horst Miracle Probe - Gray Water Tanks, Pack of 4.
I ordered them from Amazon.
Here is a really good video on hoe to install them:
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