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Powell3704
Black Goo coming from Toilet Tank Valve
Powell3704

The toilet tank valve seal is creating a black goo that is getting on the porcelain surfaces in the tank and in the toilet bowl. I've read that this black goo happens to black flapper's when they age and the only fix is replacement. My questions are, is the tank vale seal going bad and will it need replacement? If the tank valve seal is going bad are there any non-black seals available so this won't happen in the future? Also what can I use to clean/remove the black spots from inside the tank and bowl areas? I've tried bowl cleaners but they do not fully remove the spots.

A. Spruce
Re: Black Goo coming from Toilet Tank Valve
A. Spruce

I have not heard of flapper deterioration causing the slime layer in the tank, I think that more comes from stagnant water, not unlike your pet water bowl growing algae if it is not cleaned periodically. Generally, it's not a problem, and generally it doesn't show up in the bowl. You could give the tank a dose of bleach along with a good scrub, that should knock back the slime and remove most of the staining.

Unless the flapper is leaking, there isn't much cause to replace it, however, it is an inexpensive and easy thing to do if you wanted to see if it will make a difference.

Fencepost
Re: Black Goo coming from Toilet Tank Valve
Fencepost

Chlorinated or acidic water attacks some of the black rubber flappers, causing the goo you describe. Replace it with a red rubber chlorine-resistant flapper. You can get a replacement from your local hardware store for less than ten bucks, and the only tools you need to install it are your hands. Someone at the store should be able to give you some free instruction on replacement.

Be aware that *most* toilets have a universal flapper design, but there are a few brands out there that are proprietary. If you can remove and bring the old flapper in to the store (shut off the water below the tank first), that will make it easier to get the correct part.

dj1
Re: Black Goo coming from Toilet Tank Valve
dj1

Just get a replacement kit that includes all parts and replace them all: tank to bowl valve, tank to bowl bolt rubber washers and flapper.

Sombreuil_mongrel
Re: Black Goo coming from Toilet Tank Valve
Sombreuil_mongrel

Any toilet with a "super flush" system is going to be proprietary, they use special, larger flappers or pressurized systems.
I never realized that was what the red flappers were for!
Casey

Mastercarpentry
Re: Black Goo coming from Toilet Tank Valve
Mastercarpentry

I'm with dj1. If one rubber part is deteriorating the rest can't be too far behind and I'd rather have as long an interval as possible between servicing the toilet. It's NOT my favorite part of plumbing!

Phil

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