Tubes go bad fast

[lwparchive]

I work at a water treatment plant in keysville,va. we are using the pump (model 85mhp40) for sodium hypoclorite 12.5%. the tubes are going bad approx. every 3 weeks. the pump is being used approx. 25 hrs a week. any suggestions?

[dcohan]

Are the tubes riding centered on the roller assembly ? If not the roller is worn