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Old 06-15-2017, 02:04 PM   #6
Senior Member
Brand: Thor Motor Coach
Model: 37GT
State: Florida
Posts: 809
THOR #5246
Originally Posted by Frankandjane View Post
My wife and I are on different sides.... I say you should use a drop in or liquid cleanser each time you use the toilet .....My wife thinks you don't have to use drop ins or cleansing liquid every time .....what does the forum experts say or think or do ? Thanks , Frank and Jane
Frank, there is nothing worse than problems with a black tank. I have been very lucky and avoided build up, odors, leaks, and numerous other issues while full time and now part time.

The RV toilet/tank system is simple. There is no trap with water in the bottom of your toilet. The tank is vented up through the roof which helps keep the odor of the enclosed tank from hitting you in the face when you stand over the john and flush. The object is to keep enough water in the black tank so the waste and paper you deposit will be covered, to help it break down. Most black tank additives will speed up this process and help a little with some odor control. The key is to dump and rinse every time the tank is 1/2 to 3/4 full. When you rinse you should do it enough times that water is coming out perfectly clear. Then add 3 to 5 gallons of water, and your additive, and start depositing the nasties in it again.

After using the built in flush system on our first RV I switched to a Flush King attachment. It allows me to quickly backfill my black tank several times for a good cleaning out. I also close my black valve and open the gray and backflush that tank every so often. Gray tanks can develop odors over time from food pieces, hair, and other junk getting stuck in them. The Flush King allows better maintenance of all tanks IMHO.
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