Instructions for Use of Noflex Digestor

BEFORE STARTING Please have on hand: Gallon Water Jug/Bucket & Funnel

Initial Start-up

  1. Empty the holding tank.

  2. Place a funnel down into the outside pump-out fitting. Put 1 oz. (2 tablespoons) of Noflex for every 10 gallons of holding tank capacity directly into the funnel followed with 1 gallon of plain water poured down into the same pump-out fitting.

  3. For instance, if your holding tank holds 40 gallons of waste, add 4 oz. (8 Tbsp) of Noflex.

  4. Pour a 1/2 gallon of water into the toilet.

  5. Add 1 oz. of Noflex dry powder directly to the water in the toilet bowl. 

  6. Flush the toilet 2 or 3 times to get the powder down into the hoses and toilet pump.



  • You don’t need to go through the initial start-up procedure if the boat is new!

  • You may need to repeat the above steps several times if the system is excessively dirty. You can tell this if you still have smells from the vents/lines OR pump-outs don’t completely empty the tank.


Regular Use

Every other day, flush 1 tablespoon of Noflex along with 8 oz. of water for each 2 people on-board. For instance, for a family of 4, flush 2 tablespoons of Noflex with water every other day.


If storing the boat for more than a week, add 1 oz. of Noflex for every 20 gallons of holding tank capacity and then flush the toilet 3 or 4 times with at least ½ gallon of water each flush before leaving the boat.


  • After a pump-out, flush 1 tablespoon of Noflex for each 2 people on-board along with 1/2 gallon of water.

  • If you have multiple toilets, flush Noflex down a different toilet each time you do every other day treatments.

  • With gravity toilets, add additional ½ tablespoon treatment every other day.


Long-Term Boat Storage

PLEASE read the instructions on long term storage holding tank service if storing the boat for more than 1 month.



Boat RV Holding Tank Treatment | Boaters Mate

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