Community Forums

oilcan · 04-10-2019, 01:11 PM

Hi everyone I have an issue with the flush system on the black tank on our 99 Monaco Windsor the problem seems to be that very little water will enter the tank via the flush connection. is there any type of cleaner that can be installed in the tank through the toilet that may help this issue

thanks oilcan 99monaco windsor

puttin · 04-10-2019, 02:28 PM

It's probably because that connection is clogged. My recommendation is to use a Flush King at your sewer outlet for the time being. Our rv didn't come with a dedicated flush connection so this is what we use...it's worked great for 11 years.

TonyMac · 04-10-2019, 02:51 PM

I took my flush head out and drilled the holes bigger. It doesn't spin, it has 17 little holes drilled in it and just sprays. It was plugged up pretty bad with ick and nastiness. Silicone it up real good, put it back in, leak check it and it's good for another decade. ez.

Then, when I use it, I put a big squirt of antibacterial, grease fighting, cheap liquid dish soap in the hose first, then connect it and turn it on. Maybe it helps keep the nozzle clear and helps clear the tank, maybe not.

K7JV · 04-10-2019, 03:00 PM

You will have one or maybe two nozzles that penetrate the top or the very end at the top of your black tank that is plumbed from the hose fitting you use to flush it. There is also a vacuum breaker between the hose connection and the spray nozzle(s).

The main lines are likely not the issue. It would take a lot of buildup to plug a ½" PEX pipe.

The vacuum breaker could be compromised by water hardness deposits keeping it from opening fully. That breaker is probably behind some cupboard drawers, or under one of your sinks. I've even heard of them being behind the shower enclosure, but doubt that would be the case. You can take it apart and clean it or replace it. They are somewhat standard devices.

The most likely culprit is the spray nozzle(s) itself. On the inside of the tank, I would expect to see a brass device, maybe ½" x 1", or so, with several very tiny holes drilled into the sides and the end of it. Hard water definitely is a big enemy to those small holes. If you can find it or them, and get to it to remove it, you can probably clean it up. I've not tried CLR, but it might work if you soaked it long enough. You could also help to clean it up with a Dremel, and possibly push a tiny wire thru the holes to open them up. Or you could even drill each of them out with the smallest drill bit that you have. You could then use that bit to clean it up in the future. The holes would likely be larger, so it would flow more water and produce slightly less spray pressure, but it would probably still work quite well for you.

Old-Biscuit · 04-10-2019, 06:05 PM

Spray nozzles are plastic with tiny holes drilled in them
Holes get plugged up from minerals in water supply and/or stuff if tank is filled to FULL

oilcan · 04-13-2019, 10:11 PM

thanks for the replies I will try giving it a good shot of CLR as you can hear some water entering the tank will fill a short section of hose with CLR then connect the water line maybe that will help if not I guess it is going to be a sh**ty job

thanks again for the replies oilcan

DrDaveMA · 04-13-2019, 10:34 PM

There are people that flush out both black and grey water tanks with high pressure water. The problems occur when folks think they are conserving water by putting small amounts in the tank. What happens is that the poo builds up a pyramid and solidifies. It can also plug up the flush head. The best thing to do is get it flushed with high pressure and then use plenty of water with each flush. I always start with 15% in the tank and go from there. The black tank is not the place to save water.

RustyTools · 04-14-2019, 05:40 AM

A very good message, and one to be appreciated.

We were at the old Florida Monaco Service Center awhile back, and I got to talking with one of the service guys. I forget the exact details, but he said he was working on the black tank of a coach that the owner had died suddenly while on a trip, and the coach had sat for a long time as-is, til relatives (or the bank, or someone) got around to retrieving it.

He said the frig and interior smelled terrible from spoiled food, etc, but the contents of the almost-full black tank were almost dried and solidified. Last I heard, they were considering cutting out a portion of the tank to get out the 'stuff'.