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Do you mean it takes a long time to fill the tank? Just to be clear, once the tank is full, you can flush twice using what's already in the tank and then the tank takes a long time to fill all the way back up? If that's the case, then yes, I'd consider replacing the valve which shouldn't cost more than $10. I replaced my valve via YouTube last year and it's still holding strong. There are also some instructions on how to clear debris that might be blocking your valve. That didn't work so I replaced the valve with a $7 part I bought from Walmart and 30 minutes later the valve was working great.
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