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Polyethylene/Polypropylene
Polyethylene/polypropylene “poly" tanks can be rotationally molded in one piece or injection molded in two pieces. Some early poly tanks were prone to deflection and splitting during installation and in service. Newer model tanks have a ribbed/corrugated design to increase structural performance. Use of high-quality raw materials and careful attention to manufacturing practices are essential for the structural soundness and watertightness of any septic tank.As with tanks made of other materials, access riser joints and pipe penetrations must be properly sealed to make sure they do not leak. Rubber and plastic pipe seals are routinely used in the production of
