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Mobely t1_j6l40b4 wrote

The air gap advantage is that sewage can never get into your dishwasher. I've had sewage backups in an apartment, it spills over the sink sometimes.

If you do not have sewage backing up into your sink due to clogs from upstairs drains, then a high loop is all you need.

If you ever have sewage back up, then it's backed up into the dishwasher (highloop setup) and you will need to run a few sanitary cycles before cleaning dishes in it.

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jinbtown t1_j6n2rsb wrote

This is my understanding as well. Nothing to do with the pumped wastewater reentering the dishwasher.

What I'm confused about is, doesn't every dishwasher have a check valve on the drain pump outlet, or in the drain hose?

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Mobely t1_j6n99p9 wrote

I don't think a dishwasher can have a check valve as they are designed to remove food particles. A check valve might get clogged pretty quick under those use conditions.

I'm talking out of my ass ofcourse, some models might have those valves since some models have a built in high loop. But code is code, and it's meant to protect the average user. I think the manufacturer would have to send a lobbyist to ask every state, city, and township to update their code as well.

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jinbtown t1_j6nbwxb wrote

interesting. I know for certain my Bosch has a check valve, but it also has a metal mesh filter to prevent food particles from ending up in the sump.

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