Tilmaamaha isticmaalka:
1. Ku raaci biyaha taangiga asalka ah ka hor intaanad isticmaalin.
2. Waxaa lagu talinayaa in la wada isticmaalo bakteeriyada nitrifying marka haanta cusub la furo, taas oo ku haboon in si degdeg ah loo dhiso nidaamka bakteeriyada nitrifying kaamil ah.
3.Waxa loo isticmaali karaa taangiga filter hoose ama taangiga filter sare.3-6 bilood kasta, si fudud ayaa loo raaci karaa asalkabiyaha haanta.