بسم الله الرحمن الرحيم
Urine is impure. If it is filtered, it would still remain impure because filtering simply removes the foul odor. Its nature does not change. Therefore, it will not be permissible to benefit from it (use it) nor is it permissible to obtain purity from it.
أفضل التطبيق العصري على مسائل القدوري
للمفتي محمد أشرف الاشاعتي
Vol.1 Pg.132