If it is less than 2 years old and was not used on a wavemaker it would be a warranty issue, email me your invoice and a photo of the prop- Tunze at sbcglobal net
This pump cannot be used on a wavemaker and that will cause broken props, they are readily available on tunze.com, 6060.120 is the blade only, 6065.700 is the full assembly for one made before 2012 (removable shaft) and 6065.701 is for one made after 2012 (fixed shaft).