From time to time the black water holding tank gauge
lights on my RV monitor panel stop reading properly. This is almost always caused by contaminated contacts inside the tank.
Usually an extra good tank rinsing with the toilet wand is all that's needed.
If that doesn't work I wash the tank by filling it with
hot water and liquid laundry detergent and letting it stay for about and hour and then rinsing with the toilet want.
When traveling.
After dumping and rinsing the tank I fill it 1/3 full and
add laundry detergent. The agitation while driving usually does the job. About half the amount of liquid detergent called
for in a normal washing machine load is enough.
A bag or two of cracked ice dumped in the tank through the
toilet just before hitting the road will scour the inside of the tank while you drive.
When Not traveling.
Again, after dumping and rinsing the tank, I use a little
more detergent and completely fill the tank using the toilet wand. Using the wand helps dilute the detergent and also creates
some suds. Let the tank stand full and soak for an hour.
Then drain the tank and rinse with the wand. Let the tank
stand empty for a while to allow the contacts to dry and then check the gauge. If the system monitor still doesn't read right
it's probably time to call a service technician.
Except for using the wand, you can use the same procedures
to clean the gray water tank.
Return to Tips | 
