did you clean the impeller magnet and chamber? You need to get rid of the muck that has accumulated around it. Look at the magnet, is it still dark grey or has it become shiny and scratched? If it has, the impeller needs to be changed.
You also need to clean the attachment nozzle well. Check you pipings to see if there is any blockage. Since you attached it to a reactor and UV filter, expect that there will be a drop in flow-rate..but it would not be half.
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