I have read several places that you should put a cup of Calagon Water Softner in the black tank. This helps clean off the sides of the holding tank. Also add a cup of Cascade Dish Washer soap - in the dark green bottle - it contains enzymes that cut grease and grime - the enzymes help break down the solids. It is also important to add RV chemical treatment - controls odor-make sure you get the kind that has enzymes in it. Put the three items in the Black tank after you dump it and add about 5 gallons of water. All the above items can be found in most Super Walmart stores.
When you are in an RV park for a week or more, it is important to keep your black water tank valve closed until the tank is full. If you don't do that, then the solids pile up in the holding tank like a pyramid and the liquid just goes down the sewer. You need the chemicals and the liquid in the tank in order for the chemicals to work in breaking down the solids. Even when you come back from a trip (assuming you are not storing in 32 degrees or lower temperatures) you should add back 5 to 10 gallons of liquid, along with the chemicals while it is in storage.
Then the holding tank is ready to go for the next trip.
I started to travel more fulltime in October and just connected the sewer to the RV sewer system. After about 5 weeks my tank was plugged up and I had to pay a RV repair guy $184.00 to get it unplugged. Also buy the bio-degradeable toilet paper at Walmart - it is worth the price and breaks down. Regulart household toilet paper does not break down in your holding tank.
Since I have been doing the above, I haven't had any problems .
Casey Eichenauer - Member #428093