Pump/Filter blowing dirt back into pool

Jun 7, 2017
15
Nijmegen
Hey,

I've been cleaning the pool every day for 3 weeks because every day there would be a bunch of dirt on the bottom of the pool.
Usually I leave the pump running after vacuuming and notice the pool is slightly dirty again after 2-3 hours.
Yesterday I shut off the pump immediately after vacuuming and today the pool bottom was clean.
I turned on the pump and dirt is starting to collect on the bottom again.
The pump is due to be replaced because it's old and only starts when hit hard with a hammer.

What could be the issue here?

Edit: I forgot to add. When just running the filter my pressure is 0.7 bar. When backwashing it is only 0.5 bar and seems as if it cannot backwash fully, the water level I can see at the top is lower than when filtering/rinsing. Rinse seems to work fine.
 
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