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Old 10-25-2019, 11:47 AM   #29
"Formerly Diplomat Don"
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It's amazing how much people worry about their sewer tanks, both black and grey. For many it sounds like an obsession.

Many say, just go out and operate the drains every time it's needed, but forget that not every coach or coach owner is the same. My coach has a deep FWS slide that sits very low. On newer Newmar coaches, the passenger FWS, slides way out and then drops 6", straight down. This accommodates the all tile floors. Couple that with a bad back, and multiple trips to dump tanks is not something I want to do. So just because something works for you, take a moment and realize it doesn't work for everyone.

Here's another wrinkle....many new coaches, like mine, use macerator toilets so that the manufacturer is not forced to place toilets only over tanks. On my coach, black tank fluid is about the same consistency as grey tank fluid.

Again....different coaches, different uses. You have people on here with a trailer or smaller Class A with no dishwasher or laundry. Leaving the grey water shut while using either of the above CAN be foolish, since you're not in control of how much water drains. So when you say you leave your grey closed, try thinking outside your realm about how others camp before making absolute statements.
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Old 10-26-2019, 05:22 PM   #30
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Well said Don. And a great post to hit 14,000 posts with!

As far as leaving the black open, it’s pretty much standard good practice to not do it if you do not have a macerated toilet. It’s not the law, but it is the best way to “tell the masses” how to operate.

Some may have success with leaving it open, but if everyone left it open a majority of people would eventually have problems. Pyramiding is a thing, and many RV repair techs have dealt with them numerous times. So I think the people advocating against leaving the black open are just trying to help out the majority-with some good common knowledge that is in fact the best way to handle most cases. Leaving the black closed until full always works. Leaving the black open works in just a few isolated cases.

If you have been leaving the black open for years without issue, you likely have a tank just the right shape and depth to create a “pyramid poo-slide” that keeps things moving. Such a situation is in fact a lucky one but in a different coach you would likely find a different result.
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Old 10-27-2019, 07:28 AM   #31
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Originally Posted by grindstone01 View Post
But then you have to dump the tank after every laundry load or every 5 days of using the toilet. Can you imagine how many tank dumps I have avoided in our last 7 years of full timing? Probably +100 hours (estimate) not spent dumping my tanks. (15 min/week/dumping X 52 weeks/year X 7 years / 60 min/hr = 91 hours playing with dump valves)
Yeah youíve been lucky you havenít had the pyramid affect underneath your toilet or the poop builds up
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Old 10-27-2019, 07:46 AM   #32
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Dump valves closed till a dump is needed. Walking around the rig to pull a couple of levers every few days is really hard work but I am usually outside anyway. BTW it only takes seconds to pull the valves and walk away. If you are staring at the valves for 15 minutes on full hookups you are doing it wrong.
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Old 10-27-2019, 08:17 AM   #33
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Originally Posted by spdracr39 View Post
Dump valves closed till a dump is needed. Walking around the rig to pull a couple of levers every few days is really hard work but I am usually outside anyway. BTW it only takes seconds to pull the valves and walk away. If you are staring at the valves for 15 minutes on full hookups you are doing it wrong.

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