Hi Shelly, I don't know why you are not willing to allow stool to fall in the shower, so I'm going to assume you find it too gross. However, feelings can easily change when the thought process that leads to those feelings changes.
Here are a few things to think about that may change the feelings you have concerning stool falling in the shower:
1) What's the difference between stool falling on the water on the porcelain of a toilet before it enters the sewage pipes, and stool falling on the water on the porcelain of a shower before it enters the sewage pipes?
2) You've been carrying this stool around inside you where it's touching many of the molecules of your body, so why does it matter if it touches the molecules of your shower?
3) By showering with an appliance on, you force some of the stool to stay in contact with your stoma and any exposed skin around the stoma instead of letting it be washed away and down the drain.
4) Giving the skin around the stoma a chance to be washed and exposed to air reduces the risk of having problems with that skin.
This photo illustrates how easily a misperception can lead to an unnecessarily unpleasant feeling:
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