Unfortunately chlorine doesn't do much for controlling filamentous iron bacteria or sulfate reducing bacteria
If you really want to get rid if it before your pex lines are plugged then
Get a gallon of NSF 30% peroxide
Get a quart NSF surfactant, add an ounce or about 30 mls
Fill the tank up to about 4 inches or to a depth to cover the blob
Adapt an air fitting to the inlet water line to fill the tank, replumb if needed
Slowly turn air on and increase to agitate the solution
As noted in my earlier post the manual fill cap has to be open unless you want a larger water tank
After you get the blob dissolved and flushed then start sanitizing the entire plumbing including the hot water heater
There are only a couple effective biocide products however they are not NSF
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