confused on which pump to use

chris_s918

New member
i want an internal in sump pump, i am using insted of majorty pvc im using tubing one inch compleatly clamed and barbed on i only have one 90 degree angle on one return bulk head and the other bulkhead i have two return pump bulkheads and two drains all sepirate from each other so if one clogs it doesnt over flow the tank , but all holes are one inch my tank is 5 ft off the ground from the top return and 75 gallon and da 40 gallon sump, i dont have any idea how to determin the ammount of flow i need on the return idk how much draining i have its gravity based
 
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