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Old 02-28-2018, 05:49 PM   #1
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Screen filter on Toilet

My Dometic 300 toilet doesn't add water to the bowl except a for a very light trickle. (No joke - it's not very old). I read in the manual to check the supply line filter for sand, but I can't find it. I disconnected the supply line at the inlet valve thinking it should be there, but it's not. (I did however find a very chewed up gasket at that junction which is not usable anymore - I'll have to try to find a new one of those). So just where is the inline screen filter? Thanks in advance.
Here's a pic of the gasket I need to find.
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Old 02-28-2018, 07:13 PM   #2
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It is not a filter per say it is just a waffle hole plastic that is just inside the port where the water supply is attached. It's non removal. This is what is on the 310/320.
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Old 02-28-2018, 07:23 PM   #3
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I have used a toothpick to pull blockage from inside the port that the strainer had blocked. Unless that gasket was blocking the input water line it does sound as though the strainer blockage might be your issue. That gasket is a common gasket for 1/2 inch pex tubing connections.
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Old 02-28-2018, 07:35 PM   #4
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Ok here's what I do.Put a towel down on the floor, disconnect the water line and pull it away from the fitting. Get one of the bendy straws (that you use for drinking) put it in the toilet fitting and blow hard. All the gunk will fly out, put the water hose back, and you're good to go(pun intended) for another 6 months.
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Old 03-01-2018, 01:54 PM   #5
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External water filter

Quote:
Originally Posted by TsnTexas View Post
My Dometic 300 toilet doesn't add water to the bowl except a for a very light trickle. (No joke - it's not very old). I read in the manual to check the supply line filter for sand, but I can't find it. I disconnected the supply line at the inlet valve thinking it should be there, but it's not. (I did however find a very chewed up gasket at that junction which is not usable anymore - I'll have to try to find a new one of those). So just where is the inline screen filter? Thanks in advance.
Here's a pic of the gasket I need to find.
Attachment 163749
Use one of these when you connect to campground water or fill your tanks and the problem won't recur.

Larry
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Old 03-01-2018, 02:33 PM   #6
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We had that "trickle problem" also. After shutting off city water and/or the water pump, I open the outdoor shower cold valve in the basement to relieve pressure. Then I put a plastic grocery bag around the peddle valve assembly and spray it out with canned air that I use for computer keyboards. As this is a blind shot, I give it an ample spraying. Then wrap the thread with Teflon tape and leave a paper towel under for a bit to be sure it doesn't leak.
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Old 03-01-2018, 02:50 PM   #7
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Originally Posted by Larry-NC View Post
Use one of these when you connect to campground water or fill your tanks and the problem won't recur.

Larry
The clogging typically comes from within and the use of an external or the built in filter will not help. I think it comes down to winterization procedures and the occasional draining.
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Old 03-01-2018, 03:17 PM   #8
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See photos.
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Old 03-01-2018, 03:24 PM   #9
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Thanks, 5picker!
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Old 03-01-2018, 03:43 PM   #10
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Thanks 5picker, pictures are worth a thousand words.
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Old 03-01-2018, 04:33 PM   #11
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Had a white substance on mine , I used a piece of wood and a shop vacuum to clean it, hasn’t happened again??
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Old 03-01-2018, 04:41 PM   #12
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Lots of comments have been made that the blockage of this crystalline crud is from the water heater. Iíve cleaned out my nozzle a couple of times.....got this taking the toilet apart down to an art now, whenever it happens.

I still canít figure out how crud from the water heater finds itís way to the water line feeding the toilet. It doesnít take much crud at all to significantly slow the force of water into the toilet.

My $0.02
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Old 03-01-2018, 05:12 PM   #13
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I still canít figure out how crud from the water heater finds itís way to the water line feeding the toilet. It doesnít take much crud at all to significantly slow the force of water into the toilet.
Do you drain the water heater without bypassing it? I've read that can cause this exact symptom.
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Old 03-01-2018, 06:27 PM   #14
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Do you drain the water heater without bypassing it? I've read that can cause this exact symptom.
Kind of, yes... draining the water system between trips using the low point drains (and not closing the valves at the water heater) can suck the 'white crud' from the water heater into the plumbing system where traces reside in the pipes and then gets pushed throughout the plumbing system when you repressurize the system.

It especially gets sucked in the cold supply line because it is the lower connection on the water heater tank.
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Old 03-01-2018, 10:55 PM   #15
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Thanks for all the good and helpful discussion.
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Old 03-02-2018, 10:25 PM   #16
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Good advice to drain the water heater before the rest of the system.
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Old 03-02-2018, 10:28 PM   #17
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Thanks for all the good and helpful discussion.
Ditto, great thread.
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Old 03-03-2018, 06:30 PM   #18
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Update: I've pulled the toilet and found that white water heater junk clogging the filter. Also have the right gasket for the supply line fitting. Now of course my wife decided we need to upgrade the toilet which will most likely lead to a new sink, faucet, countertop, and - on and on. Such is life, thanks for your great information. Happy Camping!
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Old 03-03-2018, 07:04 PM   #19
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Kind of, yes... draining the water system between trips using the low point drains (and not closing the valves at the water heater) can suck the 'white crud' from the water heater into the plumbing system where traces reside in the pipes and then gets pushed throughout the plumbing system when you repressurize the system.

It especially gets sucked in the cold supply line because it is the lower connection on the water heater tank.
I put a check valve in the water heater feed to prevent this issue.
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Old 03-03-2018, 07:37 PM   #20
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Update: I've pulled the toilet and found that white water heater junk clogging the filter. Also have the right gasket for the supply line fitting. Now of course my wife decided we need to upgrade the toilet which will most likely lead to a new sink, faucet, countertop, and - on and on. Such is life, thanks for your great information. Happy Camping!
Make sure she doesn't read the long thread that recently ran on putting a bidet in your RV. If she catches that you might have an even larger list.
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