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Toilet tank hissing sound and slow leak?
I had just congratulated myself (HO) on setting the blue adjustable Toto fill valve at the correct height so now the bowl and tank fill to proper level. (I had also replaced the fill valve cap R528.) Flushes well and refills quickly.
A few days later I notice the tank water level goes down slowly and I hear a very slight hissing from the fill valve. I figure that would more likely be the 9-year old flapper leaking water but when I press flapper, hissing sound still there.
When I replaced the cap I didn't take the final step of cleaning the fill valve filter--usually at the bottom where it meets the water supply, if it even has one. Or I think if you remove the R528 replacement cap I've seen guys pull the assembly below it to reveal the filter. But an issue with the fill valve wouldn't lower the water level would it? Fill valve is 15 years old.
Now just flushed again and heard no hiss after it filled. Will have to check water level later. Perhaps when I rubbed down the flapper I dislodged some grit?
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