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Old 10-31-2010, 06:00 PM   #1
Join Date: Oct 2010
Posts: 98
How much Calgon liquid do you use in Black Tank?

I got lucky and managed to purchase 2 bottles of Calgon liquid at our local Wal-Mart. Now my question is how much do I put in the black tank. Also do I use any in the gray tanks?

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Old 10-31-2010, 07:54 PM   #2
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I put 2 cups in the black tank everytime I empty (with exception of extended stays)along with a couple gallons of water. I put 2 cups in the grey tank every couple uses. BTW there are 4 cups in a bottle of Calgon.
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Old 11-01-2010, 07:15 AM   #3
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I use a capful or 2 when I add water for the next trip. A bottle will last me a season.

I don't use add anything for the grey tank. I figure enough grease goes out with the dishwater to keep the tank sides slick, and the dump valve lubricated.

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Old 11-01-2010, 11:06 AM   #4
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I do as mtnguy does, but I add just one capful after emptying, and one or two gallons of water to the black tank. Nothing in the gray tank, as I've never noticed any problems with them. We RARELY ever need to add any type deodorizer to the black tank either, and don't own any type of tank flushing or washing equipment. Just Calgon and water in an empty black tank BEFORE you leave home, or if you can, after you dump the tank. You should stay trouble free. We also use Wal mart Angel Soft 2 ply (septic safe on package), no need for the pricey one ply RV stuff. Randy
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black tank

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