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Old 06-13-2013, 08:56 AM   #2
sunchaser
Guru
 
City: Carefree, Arizona
Vessel Name: sunchaser V
Vessel Model: DeFever 48 (sold)
Join Date: Apr 2008
Posts: 10,188
You might try:

Is the black stuff slime or sandy grit? If slime:
  1. Drain your water and heater tanks completely to the bilge
  2. Partially refill and drain again about 3 times
  3. Fill and let sit for an hour or two with about 1 cup of bleach for each 100 gallons while flushing through the system.
  4. Drain and repeat #3.
  5. Add a "purifier" and follow system odor - assess need to retreat in a month or two.
If grit, flush tanks several times until grit gone. You may want to buy a hose end filter prior to refilling as problem may be source of water
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