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Marine Holding and Water Tank Installation

Marine Water / Holding Tanks should always be stored out of direct sunlight, and protected from freezing. Prior to installation, tanks should be at room temperature for a minimum of six (6) hours. The tanks must be installed on a flat surface, be clean and totally supported in all planes with 1/2" - 3/4" marine plywood or equivalent.

  • Install tubing and fittings so that there are no points of stress on the tank. Use elbows to prevent partial bending or collapsing of the tubing when a change in direction is required.

  • Plastic tank connections are designed to seal dry. Compounds such as sealants, pipe dopes, greases, petroleum jellies, glues or adhesives are not to be used. Normally, hand tightening will provide adequate seal. On occasion, a slight tightening with a wrench may be required. To avoid damage to fittings, do not apply excessive force. Do not exceed 1/4" turn after hand tightening.

  • Do not install metal fittings in the plastic tank as the materials are not compatible.

Should you desire to test the potable water tank or water system for leaks, fill with water and check visually.


Sanitizing RV & Marine Water Tanks

To assure complete sanitation of your potable water tanks, it is recommended that the following procedures be used. This applies to new systems, tanks that have not been used for a period of time or tanks that may have become contaminated.

  1. Prepare chlorine solution using one gallon of water and a 1/4 cup of Clorox or Purex household bleach (5% sodium hypochlorite). With water tank empty, pour chlorine solution into tank. Use one gallon of solution for each 15 gallons of tank capacity.
  2. Complete filling of tank with fresh water. Open each faucet and drain cock until all air has been released and entire system is filled.
  3. Allow to stand for three hours. -- Drain and flush with potable water. (Important)
  4. To remove excess chlorine taste or odor which might remain, prepare a solution of one quart vinegar to five gallons of water and allow this solution to agitate in tank for several days by vehicle motion.-- Drain and flush with potable water. (Important).

The above recommendations conform to Section 10.8 in the A119.2 code covering electrical, plumbing and heating of a recreational vehicle.