If you will look at the original post, you will see that the gentleman had already tried ice cubes and Calgon. Why suggest something he has already tried and it apparently didn't work? My post was to inform the person that tank level sensors are not always bad because they have residue on them. Some tank sensors are just so poorly designed that they will never give good results no matter what you put in them.
Artemus Gordon wrote:
The GEO method may be effective for all I know but I haven't had any trouble with sewage tank residue and I have never used water softener. My problem with tank level sensors is unrelated to whether the tank is clean or smells bad. The level sensor on my tank is flaky and exhibits such little accuracy that it is no better than just guessing. The indicator is calibrated in thirds. However, I have determined experimentally that the tank can be less than 1/2 full or 4/5 full and it will read 2/3 either way. It shows 1/3 full after about a gallon has been flushed. Pouring Calgon or bags of ice down the hole will not improve that situation.
Yes your absolutely right! Yes I agree, these were bad suggestions in your case. I feel terrible now! I wish I could take back my post, I so wanted it to address "Every Single" situation that might possible present itself....
I did in fact read his post. I was pointing out a step in the process of actuating driving with ice in tank. Sometimes a simple additional "step" ( like driving a few miles with ice in tank) makes a difference. Having had large boats for years I have had excellent results with my tank sensors. Never a problem, including the units used on my current trailer. That said, call me am optimist, but I always believe there is a solution, no matter how many things you try. One last thing...my RV repair facility tells me when customers bring in the RV for sewer repairs, the tanks are seldom anywhere near clean. That said I take lots of care with my tanks.
Assuming the probes are placed to give a reasonably accurate measure when working properly, what has worked well for us is to replace the factory probes with "horst miracle probes" they are a replacement sensor, compatible with existing sensors. They have a longer teflon insulated section and a hood over the sensor so TP etc. doesn't stick. Not perfect, but WAY WAY better than factory probes, and less expensive than the ultimate solution, the sealevel or similar guage. We also use calgon in the black and grey tanks, and I usually do my "last dump" at home with black/grey tanks at least 3/4 full. That way lots of the black tank stuff gets broken up on the drie home rather than "sticking" around if I dump at the campground. Horst also makes an improved grey tank probe set.
2011 Keystone Outback 295RE
2004 14' bikehauler with full living quarters
2004.5 Silverado 4x4 CC/SB Duramax/Allison
Two posts have mentioned the Horst Miracle Probes. While they may have worked for some my experience has not been positive. Will most likely end up installing the SeaLevel system. Wish I went with that solution from the beginning.
Thanks so much to everybody for their input. I really appreciate it.
As far as the ice cubes go I said when we brake camp we don't stop until lunch at which time I add another 10lbs. bag of ice. By the time we hole up for the night we have covered anywhere from 200 to 400 miles. Before we call it an evening I have filled both tanks and dumped. I have a clear adaptor to put on the hose and watch it come out. It usually is just brown. Then I check the gagues and sometimes it reads 1/4 full(black) to 3/4 full. I don't think it ever has read empty come to think of it. Gray tank seems to work most of the time.