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10-27-2019, 02:58 PM
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#1
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Senior Member
Join Date: Jan 2017
Location: Little Rock, Arkansas
Posts: 2,594
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Commando Black Tank cleaner -- or my gauge reads empty!
Our black tank gauge has read 2/3 full for more than a year now, and I just keep telling my wife that's just the way they are. We just dump every three days or so and try not to worry about it.
But she bought some Commando Black Cleaner the other day, so I gave it a try. I followed instructions and let it sit in the yard for 24 hours and dumped it, and the gauge reads "Empty." 
Now it'll be interesting to see how many hours it takes for the sensors to get fouled again. 
__________________
2021 Keystone Outback 221UMD
2018 Tundra Limited 5.7 liter
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10-27-2019, 03:34 PM
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#2
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Senior Member
Freightliner Owners Club
Join Date: Jul 2001
Posts: 1,576
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I’ve never seen that brand before, where did you buy it?
Nick
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Nick
Allegro Red 34QFA 2014
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10-27-2019, 04:47 PM
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#3
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Senior Member
Workhorse Chassis Owner
Join Date: Aug 2007
Posts: 849
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__________________
Jan and Rocky
Volunteers USFWS. 9,300 hrs each, 29 refuges. 04 Allegro 30DA, WH 8.1, Banks, 2012 Jeep Liberty , Brake Buddy Adv Select, 300watts Solar,  "Philippians 4:11-13 KJV"
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10-27-2019, 05:32 PM
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#4
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Senior Member
Join Date: Jan 2017
Location: Little Rock, Arkansas
Posts: 2,594
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Quote:
Originally Posted by traveler of california
I’ve never seen that brand before, where did you buy it?
Nick
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She brought it home from Camping World, but I see Rocky found it on Amazon as well.
__________________
2021 Keystone Outback 221UMD
2018 Tundra Limited 5.7 liter
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10-27-2019, 05:41 PM
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#5
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Senior Member
Outdoors RV Owners Club
Join Date: Oct 2014
Posts: 3,539
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I find it interesting that it is scented. How would you know? If you can tell that it's scented there is something wrong with your holding tank vents or toilet bowl seal.
Once the tank is clean start filling the tank 25% full of water before use. No water and stuff sticks to the tank and causes lots of issues.
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2020 F28 RKS Titanium
2017 Creekside 23 RBS Sold
2016 F250 Super Crew XLT Overworked
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10-27-2019, 06:24 PM
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#6
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Senior Member
Join Date: Jan 2017
Location: Little Rock, Arkansas
Posts: 2,594
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Quote:
Originally Posted by keymastr
I find it interesting that it is scented. How would you know? If you can tell that it's scented there is something wrong with your holding tank vents or toilet bowl seal.
Once the tank is clean start filling the tank 25% full of water before use. No water and stuff sticks to the tank and causes lots of issues.
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Yeah, I know. It's like scented TP. Why? 
We start with a couple of gallons, but we don't add 25%. Our bathroom sink drains into it, though. I like that idea for more water.
We've had no trouble other than the sensors. It wouldn't surprise me for them to get fouled pretty quickly again.
__________________
2021 Keystone Outback 221UMD
2018 Tundra Limited 5.7 liter
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11-04-2019, 06:50 AM
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#7
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Senior Member
Join Date: Jan 2017
Location: Little Rock, Arkansas
Posts: 2,594
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Update:
We left home with our black tank sensors reading empty for the first time in .... like .... forever.
The 2/3 light was on after the second flush 
Oh well.
This is no reflection on the product, Commando. It just indicates how useless the sensors are.
__________________
2021 Keystone Outback 221UMD
2018 Tundra Limited 5.7 liter
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11-04-2019, 07:05 AM
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#8
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Senior Member
Winnebago Owners Club
Join Date: Apr 2019
Location: fulltime
Posts: 680
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our tank did that but i found that after emptying the tank rather then using the internal sprayer just hold the flushing pedal for 3 minutes with the drain open it reads empty
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2006 winnebago adventurer 38t 2018 carry-on hawkline enclosed 8.5x20 2007 mini cooper convertible 2012 hd xl1200c
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11-04-2019, 07:12 AM
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#9
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Senior Member
Join Date: Jan 2017
Location: Little Rock, Arkansas
Posts: 2,594
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Quote:
Originally Posted by robertkathy
our tank did that but i found that after emptying the tank rather then using the internal sprayer just hold the flushing pedal for 3 minutes with the drain open it reads empty
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Yeah. I got it down to 1/3 a time or two by filling the toilet bowl with water then stepping on the pedal to release all of it at once. The theory was that the sudden rush of a volume of water would do some good.
But .... then it read 2/3 full by the end of the first day.
I think the 2/3 sensor must be in direct line with the tank inlet or something.
__________________
2021 Keystone Outback 221UMD
2018 Tundra Limited 5.7 liter
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11-04-2019, 07:15 AM
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#10
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Senior Member
Winnebago Owners Club
Join Date: Apr 2019
Location: fulltime
Posts: 680
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Quote:
Originally Posted by EdInArk
Yeah. I got it down to 1/3 a time or two by filling the toilet bowl with water then stepping on the pedal to release all of it at once. The theory was that the sudden rush of a volume of water would do some good.
But .... then it read 2/3 full by the end of the first day.
I think the 2/3 sensor must be in direct line with the tank inlet or something. |
not filling the bowl just let it keep flushing, have not had a miss reading since i started doing this
__________________
2006 winnebago adventurer 38t 2018 carry-on hawkline enclosed 8.5x20 2007 mini cooper convertible 2012 hd xl1200c
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11-04-2019, 07:38 AM
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#11
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Senior Member
Join Date: Jul 2017
Location: Michigan
Posts: 1,010
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I gave up on the tank sensors long ago. Once you get a feel for your fresh supply vs. waste tank tank volume, they really aren't vital anyway.
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11-04-2019, 07:58 AM
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#12
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Registered User
Join Date: Oct 2017
Posts: 4,985
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We haven't even looked at out tank gauges in a couple of years now. Most of the time we leave our tank valves open when parked with FHU's so tank level is a non-issue. If the fresh tank is being used, I can just open a storage compartment and see the tank and water level.
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11-04-2019, 08:15 AM
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#13
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Senior Member
Join Date: Jan 2017
Location: Little Rock, Arkansas
Posts: 2,594
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Quote:
Originally Posted by steve52
I gave up on the tank sensors long ago. Once you get a feel for your fresh supply vs. waste tank tank volume, they really aren't vital anyway.
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We've not totally given up. Our black reads 2/3 but will read full if I get it within 5 gallons. So a full reading during the night isn't an emergency. 
Our gray is larger but usually fills up more quickly, so we just dump both when the gray needs dumping, and those sensors work. We do, however, keep an eye on the black -- just in case.
__________________
2021 Keystone Outback 221UMD
2018 Tundra Limited 5.7 liter
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