Review on 💧 Valterra T21301VP Horst Miracle Probe - Black Water Tanks, Pack of 4: Optimal Cleaning Solution for Waste Management by Tim Bunker

Horst sensors read our gray tank correctly again. The original fuel gauges are inherently inaccurate and although they worked for several years one gauge had dirt and the tank read 1/3 full when empty. I tried a heavy duty tank cleaning chemical that removed a lot of "things" but didn't clean this sensor. Since there is no way to get into the tank to flush it like a black tank, it's time to replace them. Now it reads blank after the dump. I would highly recommend these sensors and the replacement was pretty easy using YT's video on how to remove the old ones. I have Horst Black tank sensors on the way and will be replacing them as well.