The utility model provides a flushing -free filter is responsible for to earth source heat pump, include fluid casing, blowdown casing, exempt from flush assembly, the fluid casing is the tubulose with the blowdown casing, and fluid casing both ends are fluid entry and fluid issuing respectively, and blowdown casing both ends are sewage discharge inlet and waste outlet respectively, sewage discharge inlet is close to fluid entry one end with the fluid casing and is linked together, forms Y shape with the fluid casing, waste drainage cover is installed in the waste outlet cooperation, it includes filter core, brush and interior axle to exempt from flush assembly, interior axle is " worker " word tubular structure, epaxial interface, the lower interface of interior axle, interior axle main part in including. The utility model discloses the debris of remaining at filter core internal and external surface can effectively be got rid of through the rotation of interior axle to simple structure, stable performance, open the clearance that waste drainage cover can realize debris, have greatly shortened to unpack apart when abluent longly, guarantee the earth source heat pump person in charge's work efficiency.