Always try to get those air operated diaphragm pumps which remain dry without any leakage problem. Then you can rely on the capacity of a single pump for the lifetime. It has a solid wearing capacity and moreover no such thing is utilized in the running of the pump that can easily cause damage to it. There are air operated diaphragm pumps in the market where abrasive fluids can be transmitted even at 90 degrees centigrade and more.
In such cases as that, it may be a good idea to try a different type
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