Flushing the Holding Tank

Technical Articles

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For what it's worth, here is the recipe we've been using for flushing the holding tank for winter lay-up. We think it is very effective as the last flush is quite clear.

Holding Tank Recipe Ingredients: 
  2 c. Calgon Water Softener (liquid) 
  1 c. liquid laundry detergent 

Add two cups water softener in 1 gal. hot water. Pour/pump mixture into tank. Add one cup detergent to 1 gal. hot water. Pour/pump mixture into tank. Let sit for several hours then top off tank with fresh (hot if possible,) water and let sit for a few more hours. Even better is to sail with the tank full to thoroughly agitate the mixture in the tank. Pump out and rinse/pump with fresh water. 

Tip: Many RV stores carry a wand that attaches to a hose to provide a high pressure spray. Use this in the inspection port of the tank (if you have one) then rinse/pump again with fresh water. You may also be able to go in by removing the vent fitting on the top of the tank.

- Warren & Pattie Updike, Warr De Mar, #62




by Warren Updike

"Graycruiser" yeah, that's me. 1st Mate, Pattie, and I have been sailing on the Chesapeake for 18 years on charters. We bought our first boat in 2000, a C25 #5909, a 1998 in great shape. After retiring in 2004, we decided we needed a bigger boat and the C320 was just the ticket for our expanded cruising schedule and to accomodate our 5 children and 11 grandchildren. We're love'n it.

Life is better on a sailboat.

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