the problem may have started when the inexpensive rubber washer broke
on the water shutoff by the toilet or elsewhere upstream. maybe that
needs to get flushed out and replaced.
i think the disconnecting the toilet and flushing out its connecting
water line again may be needed.
run the water until clear.
installation instructions and online help for your product we use on
twenty toilets is at:
http://www.fluidmaster.com/usa.html
if you drain the hot water tank of debris you will also know what may
be coming thru your pipes.
http://www.waterheaterrescue.com/pag...r-heaters.html