If your pool pump is leaking then this is the likely cause. Mechanical seals can leak due to wear and tear or poor pool chemistry. A leaking pump or seal can cause the pump to become noisy as a result of corroding the front bearing. All easy fixes for our technicians. Mechanical seal suits all AstralPool pumps which include (P320, P600, BX, CTX, E-Series, P320xt and P520xt).