Even in the largest cities such as Manila in the Philippines, when sewer lines are extended, the septic tanks remain as integral components of the sewerage system, and therefore also require periodic desludging.
The septic tanks remain as integral components of the sewerage system. This is even in the largest cities such as Manila in the Philippines. The septic tanks also require periodic desludging. This is even in the largest cities such as Manila in the Philippines. Sewer lines are extended.