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Author Topic: Using Roebic K-57 to clean tank sensors.  (Read 252 times)

Rene T

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Using Roebic K-57 to clean tank sensors.
« on: December 11, 2017, 06:50:28 PM »
I little background first.
We've been living full time in our RV since the end of October. I have 3 tanks. 1 black and 2 gray. They have tank level indicators which read Empty, 1/3, 2/3 and full. For the past month, all the tanks read 2/3 even when they're empty. What else is new. The full light does go on when it's time to dump.
I contacted Roebic and spoke to a manager in the R & D department. I explained my situation and she said to dump 16 OZ of K-57 in the tanks and let them sit as long as possible. I did it to the galley tank because that's the one which fills the slowest. I filled and dumped the tank a couple of times before adding the K-57. The last time I filled it to the point where the full light lit. I then added the Roebic. I was able to let it sit for 72 hours before I had to dump it. The results was that when empty, the 1/3 light is lit. Better than before so the K-57 did work. I wish I could have let it sit a few more days.
We are going on a 10 day cruise the end of January and I'm going to do the same thing to all the tanks and they'll be able to sit for 10 days. I'll let you know what happens when we come home and dump all the tanks.
She also said that K-57 would be better in my case and not K-67. K-67 would be for a plugged line or trap.  She also said that Roebic has chemicals for black tank and gray tanks. 2 different chemicals. I don't know if I want to be tied to having to use chemicals. I haven't for the last 20 years and don't want to start now. I'll have to think about that.
I purchased the Roebic K-57 at a Tractor Supply store.
« Last Edit: December 11, 2017, 06:53:16 PM by Rene T »
Rene, Lucille & co-pilot Buddy
AKA  Pep N Mem
2011 Chevy Duramax 2500 HD 4X4
2011 Montana High Country 343RL
From the Granite State of NH
& Florida Snowbird in Lakeland FL


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Re: Using Roebic K-57 to clean tank sensors.
« Reply #1 on: December 11, 2017, 07:23:39 PM »
Looking forward to your results with the 10 day soak.

Enjoy the cruise,

Tom & Theresa
2004 Pace Arrow 37C, Workhorse W22, 8.1 Vortec
2014 Honda CR-V Toad, Roadmaster -5 Base and tow bar
SMI Stay and Play Duo Brake system


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Re: Using Roebic K-57 to clean tank sensors.
« Reply #2 on: December 12, 2017, 04:11:52 AM »
After 5 years of reading 1/3 full, I finally got my black tank to read empty with a product called Happy Camper.
2011 Winnebago Sightseer
2011 Honda CRV
Lovely wife and ugly dog

Gary RV_Wizard

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Re: Using Roebic K-57 to clean tank sensors.
« Reply #3 on: December 12, 2017, 09:35:56 AM »
I used Roebic 57 or 47 to clean gunk off tank walls for about 10 years, with generally good results. Rid-X works too, but I always preferred the Roebic products. Three days is about the minimum to get decent results and longer is better.  Most of that time I had external sensors and just needed to reduce the slime coating on the tank walls.  If you have internal sensors, results are more chancy because the internal sensors can catch shreds of paper that may later dry into a solid mass on the sensor when the  tank is emptier. Those can be nigh impossible to remove, even with a long soak and Roebic or Rid-X
Gary Brinck
Summers: Black Mountain, NC
Home: Ocala National Forest, FL


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