Before starting up, check that the pump is properly primed; fill it completely with clean water by means of the hole provided after having removed the filler cap on the pressing body. This ensures that the mechanical seal is well lubricated and that the pump immediately starts to work regularly. The filler cap must then be put back in place.  We recommend you read the instruction manual of the K single impeller (also available in our DNA software) for all information on the product.