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Old 06-17-2019, 01:12 PM   #1
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Dometic Toilet water flow

I have a series 300 sanitation toilet that does not has insufficient water flow rate.I have had the toilet serviced by an authorized dealer but they claim they replaced the water valve but I still have insufficient water flow. Any suggestions?
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Old 06-18-2019, 08:48 AM   #2
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Welcome to the forum its a great place to get your questions answered. Domestic RV toilets are not like your household toilet in terms of water flow. How are you determining that enough water is not flowing at the proper rate? What I do is make sure there is water in the bowl before using to ensure a proper flush and hold the foot pedal only long enough to get everything down the drain. If you are having problems with stuff being left behind try putting in more water to start with.
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Old 06-18-2019, 12:49 PM   #3
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Thank you Seadog. I have resolved the water flow problem. Even though the dealer said that they replaced the water valve, it was not true. Took the water valve out and the valve was clogged with calcium build up. Order new valve and will go from there.
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Old 06-18-2019, 01:13 PM   #4
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Don't thru the old one away soak it in white vinegar that should clean it up so you have a spare.
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Old 06-18-2019, 03:01 PM   #5
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You might find that this isn't the last time you have this. Those calcium deposits came from somewhere.

First, when you drain the water heater or the low point drains- make sure you first bypass the water heater. If it's a Suburban, it could be the source of these deposits. Emptying the low point drains without the water heater bypassed can suck deposits out of the water heater.
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Old 06-18-2019, 03:04 PM   #6
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Those water valves are easily cleaned.
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Old 06-18-2019, 03:06 PM   #7
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Quote:
Originally Posted by phalpin View Post
Thank you Seadog. I have resolved the water flow problem. Even though the dealer said that they replaced the water valve, it was not true. Took the water valve out and the valve was clogged with calcium build up. Order new valve and will go from there.
Shame on them. At least now you know how much you can trust them.
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Old 06-18-2019, 03:11 PM   #8
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Shame on them. At least now you know how much you can trust them.
Or they did and it reclogged right away. Time will tell with the replacement...
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Old 06-18-2019, 03:16 PM   #9
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Or they did and it reclogged right away. Time will tell with the replacement...
You could be right Doug.

Your advice about bypassing the water heater when draining the low point drains is spot on. Not doing so sucks the calcium deposits into the plumbing system where it is redistributed throughout the system on the next pressurization.
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Old 06-19-2019, 12:33 PM   #10
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On my unit I also had calcium buildup in the unit that sits inside the toilet bowl and directs the direction of spray. Took that apart as well and soaked in vinegar then used compressed air to finish off. Works well and is a easy fix.
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