Cartridge seals can generally be reused if the pump has been disassembled to replace the wear rings. Vibration will increase as the impeller goes out of balance due to abrasive wear. This can cause drive lug wear and carbon face chipping. Vibration damping will become very important. Seal designs that incorporate O- rings have a built in natural vibration damper.
Metal bellows seals require another solution.
Wear of the rotating components. This is especially true if the seal rotates in the fluid. Better seals are designed to cause rotation of the fluid in the seal chamber. If you prefer to solve the application problem by using a special seal. Metal bellows seals.