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Carol, I'm having a little trouble figuring out how the sensors get covered when the valve is open since all the water immediately runs out the dump pipe. I wouldn't think the water could get high enough to cover even the lowest sensor. Am I missing something? I usually keep the gray valves open when we're attached to sewer. Then a couple of days before i want to dump the black tank I close them to accumulate water. I guess either way will work. I'm not sure anything really keeps the internal sensors from getting mucked up short of cleaning out the tank frequently. But I'm not an expert on this by any stretch.
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