Muddy water at the bottom of the PMM ⇐ General questions about dishwashers

[AndreiZ]

Hello everyone.
Almost a year ago, we installed the first PMM in our life, it was connected by repairmen who assembled the kitchen (built-in PMM).
Until recently, everything was fine, but now almost a day after using the PMM at the bottom We find cloudy water, there is no obvious sewer smell, but this is not clean tap water either.

We start the PMM every day at 22-23 hours, it completes the process, the bottom is dry, there are no complaints about the PMM’s work and the results , but the next day in the evening, at about 18-19 hours, there may be muddy water at the bottom. No patterns have been identified, but I’m already tired of scooping out this liquid with a sponge before using the PMM.
Where to dig, what to look at?

[AndreiZ]

2 hours after washing the dishes - the bottom is clean and dry

[Support]

The problem was found - this is a tee to the common sewer pipe from the kitchen.
I turned the tee over with the branch on the PMM up (it was a little down) and water no longer appears in the PMM.

P. S. It’s very strange that no one here even tried to help. Beaver everyone.