It has recently been demonstrated that the triplet dynamic nuclear polarization (DNP) can be used to construct an efficient neutron spin filter based on polarized protons. This motivated to drive the development of this type of spin filter to create a broadband neutron beam polarizer and a spin polarization analyzer for magnetic small-angle neutron scattering. The proton spin filter has been implemented for a first time in a neutron spin analysis experiment, which allowed investigation of the magnetization of CuNiFe alloy and distribution of the precipitates within. The polarized protons represent the only alternative to the existing 3He analyzing cells in experiments that require an opaque spin filter for neutron spin analysis. Even though the application of triplet DNP to spin filter neutrons is still under development, high neutron analyzing powers can be achieved. Further development will significantly improve the triplet DNP filter perfomance and allow various applications in future.