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View Full Version : would switching a drop commode work



dalehollow
03-22-2014, 07:08 PM
I have a straight drop unit, could I replace it with a standard home flush commode?

I have no issue with holding tank needing pumped out more often. (or extra flush water going in).

Mechanically would it work no macerator plug an play switch thanks

issues or must do's thanks

easttnboater
03-22-2014, 08:01 PM
You are going to need more fresh water as well. If that is not a problem and you have decent pressure, then it should physically work. If you do not currently have problems with the contents of your holding tank being pumped out, then I do not see how using a conventional flush toilet would be any worse.

I have seen a couple of very high end houseboats with conventional toilets.

Endurance
03-22-2014, 08:25 PM
I think it should work fine. East tn is right about the flushing water. I would suggest lake water flushing, except that even pretty clean lake water would tend to look off-color in a white toilet bowl. It might be a little more tricky winterizing a household toilet compared to an RV-style that's meant to be left off for the winter months.

42gibson
03-23-2014, 04:08 AM
we have a friend who bought a 16x73 shell from horizon in 2001 and he used regular household toilets in it. he loved them and the new owner has kept them in as well.

dalehollow
03-23-2014, 06:51 AM
you pointed out a issue I hadn't thought of the discolor water, pumping from the lake. Great point.

perhaps our holding tank water would correct that, we don't do prolonged stays, (as we 2 of us ) live close to the dock). But every wk end, we are out

IM assuming as for as water pressure goes that only means a little longer fill time . I guess the next issue is on the switch over is the pump set up?
Am I correct in assuming the same on demand pump that handles my galley is a water line over to the commode.

I totally understand the issues with the demands and the give an takes. keep the thoughts an tips coming

easttnboater
03-24-2014, 05:10 AM
If you want to use fresh water (water from your internal tanks), then you will have to tap into your house supply lines somewhere. And, yes, the amount of pressure and volume that your pump can provide will determine how long it takes the toilet to fill.

dalehollow
03-27-2014, 08:06 PM
Removed the drop commode and installed the standard flush today. Lesson learned remove old unit first. Needed a 10" rough in not 12". Regardless the new one is in. Looks fantastic.
I will get a larger on demand pump in the near future. I'll also redo a supply line. Where I can use the dock water instead of lake water, while in.
Next test, might take place next date....Wink

GoVols
03-28-2014, 06:49 AM
My buddy has a Horizon with drop flush toilets. He pumped out one time and the dock's pump out system quit working for some reason. Turns out, his fiber rich diet was to blame as he clogged the main pump out line. Macerators are a good thing.

boatlover
03-28-2014, 07:17 AM
My buddy has a Horizon with drop flush toilets. He pumped out one time and the dock's pump out system quit working for some reason. Turns out, his fiber rich diet was to blame as he clogged the main pump out line. Macerators are a good thing.

This would be my concern. Will there be a problem pumping Un-Macerated waste from the holding tank?

GoVols
03-28-2014, 01:23 PM
I'm not too proud of my familarity with my toilets b/c I never willingly set out to learn this stuff. I've had to tear mine apart a few times to troubleshit stuff.

I would think that as long as the inner diameter of your waste hoses on your boat are comperable to your house's waste pipes, you wouldn't have much trouble at all with the house-style toilets. Problem sets in with people that use gobs of TP when cleaning up.

boatlover
03-28-2014, 02:58 PM
I would think that as long as the inner diameter of your waste hoses on your boat are comperable to your house's waste pipes, you wouldn't have much trouble at all with the house-style toilets. Problem sets in with people that use gobs of TP when cleaning up.

That is where the problem could be. Household sewage lines are usually 4 inch. Waste hoses on boats are 1 1/2.

dalehollow
03-28-2014, 05:34 PM
the straight drop systems dont use a macerator......
been around a long time.

boatlover
03-28-2014, 07:27 PM
COOL the attitude. If you know everything about waste systems why are you on here asking for advice? We were commenting about the possible problems that could arise when pumping a holding tank filled with firm stool and possibly wads of paper. Good luck with sh*t.

dalehollow
03-29-2014, 12:25 PM
excuse my poor choice of wording. Those who took offense that wasn't my intention.

If your not pleased with your straight drop, the switch over is quite simple. Know if you need a 10 inch rough in on the commode might save yourself a return visit to Lowe's.
Our old system, I was just never pleased with. So the new standard flush works great. In all honesty I have heard more horror stories concerning the macerator, than marina pump out systems being fouled.

OLD HOUSEBOATER
03-29-2014, 05:55 PM
Your straight drop toilet doesn't require a vent system due to the low velocity when you open the valve. The 3/4 vent hose is big enough.

Household toilets operate on a high volume flow over a short period of time. That is why you have a large vent thru the roof of the house. A vent of this type sticking out the roof of your boat might present a problem. Without the vent your system might flush ok when the tank is low but might be problematic when the tank is nearly full due to back pressure.

The other problem is sloshing of water out of the bowl when you speed up/slow down or encounter wakes, swells, and rough sea conditions.

It's interesting. Let us know how it works when your done.

dalehollow
03-30-2014, 06:54 AM
Good Point Ole HB'er, " Without the vent your system might flush ok when the tank is low but might be problematic when the tank is nearly full due to back pressure".

Being on the dock /hb, year round pumping out isn't a dreaded issue, with that said I never let the holding tank go over 3/4's full in the past.
So at what point I create a vacuum will be my next test, If the new system will work up to 3/4's full our boating style wont be compromised. Life is good.
Anything less, I saved the drop system, ugh.

Endurance
04-01-2014, 08:16 AM
I'm thinking that venting would have been more of a problem when we had flush toilets that dropped 5 to 7 gallons in a flush. But today's more modern flush toilets use 1.5 or 1.6 gallons per flush. That's not a whole lot more water than an RV-style drop toilet would flush considering that proper use of the RV-style toilet would be to run some water into the bowl before you use it for solid waste.

easttnboater
04-01-2014, 08:31 AM
I am with you Endurance. I am actually a former plumber. The new toilets do not use as much water. They do flush pretty quickly though, but a 3/4 vent should be able to handle the airflow. Way back at the beginning of this I said as long as he had no problems pumping out with his drop toilet, he should not have any in the future.

I am pretty sure it would cause problems at the dock where I am. I do not think the solids (non-macerated) would make it through the dock's pump out system with out clogging it somewhere.

What a crappy subject.

dalehollow
04-01-2014, 01:57 PM
Reading the above, I became concerned over the vent issue, BUT, In short it doesnt appear that will be an issue.
The tank was filled completly 99% clear water. It still flushed.

The second to the last flush I saw a slight gurgle. The last flush with solid's gurgled even more but cleared.
This clued me to check my tank level and it was FULL. (perhaps next issue a tank level device is in order) semi clear plastic tank

Today I pumped out, and when the holding tank cap was taken off there was waste water at nearly at the top of the cap. (hopefuly that won't happend again)

So at capacity it vented enough for the last flush, The next issue will be be how much I can minimize the gallons I use an still get a proper flush.........

through this site the everyones input was helpful.