Hi, the magnets were to start the two magnet f!ow switches. These turn the pump on when they sense the water flowing. These can be bought as replacements. Replace these switches and the pump will be ok
Hi, I recommend replacing the pump as sometimes the insides can be scaled up and so replacing the switches doesn't always work.it involves a !little electrical wiring also.
If you get a 2 bar pump with 22mm outlets it will be easier to swap over