... filter housing bcz of latest thread thecnology .2nd ,High-accuracy PPF inserted ,is available to filter sand ,rust ,silt and blood ... and Virus Note :1st ,it is water impurity stopped on PPF when yellow and brown shows on it ,belonging to common ... clarifier is workable ,pls not worry .2nd ,pls change your PPF for less water yield abnormally when its quantity reaches 10T ...